In the Valley of the Moon, follows a young man working as a hitman for the Italian mob in 1977. He takes a job in Petaluma, California, posing as a potential buyer at an open house to confront the realtor who he suspects has a sinister connection to his past.

A neurotic delivery driver named Owen battles his OCD at a local convenience store while his TikToker girlfriend plans an exposure therapy dinner date at home. But when she helps him resist his compulsion, it subsequently triggers the apocalypse.