It stars Hannah Emily Anderson and Brittany Allen and follows a young woman fighting for her life as her wife's murderous intentions become evident.

Later, when questioned, Jackie claims that she never mentioned Jenny because she believed the accident was her fault, although the police had cleared her of any wrongdoing.

Jackie returns to the cabin, practicing the tearful phone call she's going to make to the police when reporting Jules' death.

Jules, hiding nearby, is tempted to show herself until Jackie, unaware she's being watched, reveals her concern is an act.

She slits Daniel's throat outside, chases Sarah upstairs and fatally stabs her numerous times after confessing to Jenny's murder.

Back at the bottom of the cliff, Jules takes a sharp intake of breath and the film ends with flashbacks of the couple.

The site's critics' consensus reads: "Smart, stylish, and well-acted, What Keeps You Alive proves it's still possible to spin an engrossing horror yarn without fundamentally altering established formula.

"[11] Metacritic reports a weighted average rating of 66 out of 100, based on 15 critics, indicating "generally favorable reviews".

He concluded: "the victory of What Keeps You Alive is not its heart-thumping (and a little too long) second act, but the question of survival versus vengeance the film raises.

"[14] Andrew Whalen of Newsweek wrote that the film "sacrifices its most interesting possibilities in favor of the squat simplicity of the cinematic psychopath, erasing psychological complexity in otherwise compelling characters", and added: "What Keeps You Alive never finds a motivation for Jackie beyond a hidden nature—the serial killer within."