Dr. Leo Marvin is a loving family man, as well as a well respected psychiatrist. He’s even planning on taking a vacation with his family, however his whole life comes crashing down once he meets his new patient Bob Wiley. It’s clear that Bob has some sort of mental issues, but he’s overall good at heart. Bob however becomes obsessed with Leo, even taking a bus down to the same place they’re vacationing at. To Leo’s surprise, his family warms to Bob right away. Even inviting him over for dinner, which Bob accepts. Eventually it gets to the point where Leo is convinced Bob wants to replace him as the father of the family, this drives him to absolute madness.
