You Should Have Left is a 2020 American psychological horror film written and directed by David Koepp, based on the 2017 book by Daniel Kehlmann.

The family books a vacation in Wales, but there is something strange about the house—time passes unusually fast, and everybody experiences nightmares while staying there.

Susanna reluctantly explains that Theo's first wife drowned in the bathtub, and people suspected that he killed her, though he was acquitted at trial.

Upon discovering an anomaly in the angle between the wall and floor, Theo and Ella measure the kitchen and find that it is larger inside than outside.

Desperate to escape the house, Theo and Ella decide to go to town by foot, but see a shadowy figure observing them from inside as they walk away from it.

Theo finally confesses to the true circumstances surrounding the death of his first wife: he did not directly kill her, but did not help when she was drowning; he simply watched her die because he had been miserable with her for so long.

Theo's spirit is then seen trapped inside the house, revealing he had been the figure watching himself and Ella leave the night before, having tried to warn his past self by writing the messages in his journal.

Universal decided to forego the film's originally scheduled theatrical release in the United States and Canada due to movie theater closures since mid-March, because of COVID-19 pandemic restrictions.

[15] Over the weekend of July 31, Universal lowered the price of the film from $19.99 to $5.99, and You Should Have Left finished second on FandangoNow and fifth at Apple TV.

The site's critics consensus reads, "You Should Have Left hints at a genuinely creepy experience, but never quite manages to distill its intriguing ingredients into a consistently satisfying whole.

[18] Kate Erbland of IndieWire gave the film a "B−" and said, "when You Should Have Left is at its best, it's unconcerned with mapping out such easy clarifications and leans into the raw madness of corrosive guilt and a house made to punish people who dare come inside its walls.