Only Murders in the Building, which costars and .Here's the official synopsis of the show, per a Hulu press email: “From the minds of Steve Martin, Dan Fogelman and John Hoffman comes a comedic murder-mystery series for the ages. Only Murders in the Building follows three strangers (Steve Martin, Martin Short, and Selena Gomez) who share an obsession with true crime and suddenly find themselves wrapped up in one.