The Ending Of You Should Have Left Explained

Koepp's adaptation puts a timely twist on Kehlmann's original ending. In the book, Theo is a struggling screenwriter, but movie-Theo is a wealthy and amoral banker — the virtual embodiment of white privilege. It turns out that much of the psychological distress he's experiencing in the film derives from his guilt over dodging prosecution for a serious financial crime, as well as another darker crime, which we'll get to in a minute. He pleads his own innocence to Susanna throughout the film, but his surreal experiences in the Welsh rental home suggest that his self-serving version of events may not be entirely true.

In the final sequence, Theo discovers evidence that Susanna cheated on him — thus validating all of his deepest insecurities. The evil house cooks up a disorienting labyrinth of dark rooms to keep Ella and Theo from escaping, ultimately separating father from daughter. As Theo desperately searches for Ella, he is confronted by a monstrous apparition. The corpse of his ex-wife pursues him through the house, and ultimately the devil himself emerges from the uncanny hellscape for a final confrontation. The devil demands that Theo confess the truth — not about his financial crime, but about his choice to let his first wife die of an overdose when he could have saved her. Yeah, it gets that dark. 

Theo then makes a classic deal with the devil. He confesses to his crime and agrees to spend eternity trapped in the hell house in exchange for Ella and Susanna's freedom. Bet he's wishing he had taken the prison sentence from the Feds.

You Should Have Left is currently available for VOD on most popular streaming services.