Movies like Day 21 (2025)
The best movies like Day 21 (2025) are Black Widow (1987), The Quiller Memorandum (1966) and The Lady Vanishes (2013). If Day 21 hooked you with its thriller, these 30 similar films are what to watch next, and every pick says why it matches.
Quick picks
- Highest ratedPickup on South Street (1953)7.4/10 from 342 votes
- NewestBy His Hand (2026)Released 2026
Black Widow (1987)
Federal agent Alexandra Barnes believes that Catherine Petersen is a serial killer who marries rich men and then murders them for their money. But since Catherine is seemingly a master of disguise and has multiple identities, Alexandra can't prove anything with conventional detective work. With no other option, she goes undercover, pursuing the same man as Catherine, and hoping that Catherine will slip up and reveal her true identity.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisThe Quiller Memorandum (1966)
After two British Secret Intelligence Service agents are murdered at the hands of a cryptic neo-Nazi group known as Phoenix, the suave agent Quiller is sent to Berlin to investigate.
Why it matches: Recommended by TMDB viewers · both thriller
SnoozefestMovies like thisThe Lady Vanishes (2013)
Young socialite Iris Carr befriends an older woman while traveling solo by train. When Iris wakes from a nap, the woman is gone and other passengers claim she never existed.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisSeeds of Yesterday (2015)
The Sheffield family reveal and go through some home truths as their middle child inherits the Foxworth mansion. The family's ghosts looming over, and more tragedies are in store as the curse lives on.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisThe Man Who Cheated Himself (1950)
A veteran homicide detective who has witnessed his socialite girlfriend kill her husband sees his inexperienced brother assigned to the case.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisThe Time Shifters (1999)
Tom Merrick gets caught up in a time-traveling conspiracy and must set the timeline right before it is irrevocably altered.
Why it matches: Recommended by TMDB viewers · both thriller
SnoozefestMovies like thisThe Dark Mirror (1946)
A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer.
Why it matches: Recommended by TMDB viewers · both thriller
Worth the HypeMovies like thisWhile the City Sleeps (1956)
Newspaper men compete against each other to find a serial killer dubbed "The Lipstick Killer".
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisPickup on South Street (1953)
In New York City, an insolent pickpocket, Skip McCoy, inadvertently sets off a chain of events when he targets ex-prostitute Candy and steals her wallet. Unaware that she has been making deliveries of highly classified information to the communists, Candy, who has been trailed by FBI agents for months in hopes of nabbing the spy ringleader, is sent by her ex-boyfriend, Joey, to find Skip and retrieve the valuable microfilm he now holds.
Why it matches: Recommended by TMDB viewers · both thriller
Worth the HypeMovies like thisMetropia (2009)
In the near future, oil reserves are nearly depleted and Europe is connected by series of underground tunnels. While navigating these tunnels, Roger hears voices, one in particular. Seeking a way to rid himself of the voice only leads Roger deeper into a bizarre conspiracy of control - mind and body.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisScandal Sheet (1952)
A tabloid editor assigns a young reporter to solve a murder the editor committed himself.
Why it matches: Recommended by TMDB viewers · both thriller
Worth the HypeMovies like thisThe Locket (1946)
A dark personal secret drives a young woman to use every man she encounters.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisCornered (1945)
A World War II veteran hunts down the Nazi collaborators who killed his wife.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisThe Spiral Staircase (1946)
On a stormy night, the mute servant to an ailing matriarch is stalked by a serial killer.
Why it matches: Recommended by TMDB viewers · both thriller
Worth the HypeMovies like thisConflict (1945)
Unhappily married Richard Mason concocts a meticulous scheme to kill his shrewish wife so that he'll be free to marry her sister.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisPeeping Tom (1960)
Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.
Why it matches: Recommended by TMDB viewers · both thriller
Worth the HypeMovies like thisNo Name on the Bullet (1959)
When hired killer John Gant rides into Lordsburg, the town's folk become paranoid as each leading citizen has enemies capable of using the services of a professional killer for personal revenge.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisMermaid Down (2019)
A mermaid is ripped from the ocean by a fishing crew only to be tortured and to have her tail cut off. A seemingly helpful stranger intervenes, but then locks her away in an institution for mentally disturbed young women, where no one believes she is a mermaid. With no way out, she is forced to count on her survival instincts, and fight for her life at all costs.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisThe Night Stalker (1972)
Wisecracking reporter Carl Kolchak investigates a string of murders in Las Vegas and suspects the culprit is a vampire. His editor thinks he's crazy and the police think he's a nuisance, so Kolchak takes matters into his own hands.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisManiac (1963)
When a stranger enters a quiet, country town and is seduced by a sensuous married woman he unwittingly finds himself at the centre of a storm of sexual guilt and murder.
Why it matches: Recommended by TMDB viewers · both thriller
Popcorn FlickMovies like thisBy His Hand (2026)
Emma has spent her entire life trapped in Fowler’s fundamentalist cult. After a final act of humiliation, she decides to flee. Sam, a fellow member, bound by guilt and defiance, agrees to help her escape.
Why it matches: Similar story and style · both thriller
Twisted Marriage Therapist (2023)
A couple seeks counseling to save their marriage with a caring therapist; but the husband soon realizes that she is obsessed with his wife and will do anything to get her.
Why it matches: Similar story and style · both thriller
Sweet Pea & Glass (2023)
Two rookies have one last chance to prove themselves to the "Suits" gang. All they have to do is ditch a body in enemy territory without being caught. If the rival "Scars" don't kill them, their boss sure will.
Why it matches: Similar story and style · both thriller
Sew Torn (2025)
A seamstress gets tangled in her own thread after stealing a briefcase from a drug deal gone bad. In an escalating game of cat and mouse, her different choices lead to drastically different outcomes along the way.
Why it matches: Similar story and style · both thriller
Popcorn FlickMovies like thisThe Shade (2024)
Twenty-year-old Ryan struggles with a debilitating anxiety disorder following his father's death. Together with his two brothers, he must fight to break the destructive cycle threatening their family as ancient darkness closes in on them.
Why it matches: Similar story and style · both thriller
Epitaph (TBA)
An ex-Army marksman's plan to avenge the murder of his parents brings him into business with a murder-for-hire organization and the C.I.A.
Why it matches: Similar story and style · both thriller
Erasure (2023)
The story follows the lead singer of a punk rock band who is haunted by an enigma of a woman after a terrifying encounter with the newest street drug, Black Toad.
Why it matches: Similar story and style · both thriller
Dead Mail (2024)
An ominous help note finds its way to a 1980s post office, connecting a dead letter investigator to a kidnapped keyboard technician.
Why it matches: Similar story and style · both thriller
SnoozefestMovies like this
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Frequently asked questions
What are the best movies like Day 21?
The closest matches to Day 21 are Black Widow (1987), The Quiller Memorandum (1966) and The Lady Vanishes (2013). Below are 27 more, each with the reason it matches.
What should I watch after Day 21?
Start with Black Widow (1987), the closest match to Day 21.
What is the highest-rated movie like Day 21?
Pickup on South Street (1953), rated 7.4/10 by 342 TMDB users.
What is the newest movie like Day 21?
By His Hand (2026) is the most recent release on this list.
Are there English movies like Day 21?
Yes: Black Widow (1987), The Quiller Memorandum (1966) and The Lady Vanishes (2013).
How are movies similar to Day 21 chosen?
First come films that Trakt’s viewers watch alongside Day 21, then TMDB’s recommendations and films it rates as similar in story and genre. Each pick says which signal put it there.