Kristen Schaal wants to be a mystery solver and happens to meet the Gang as they investigate a haunted hospital with the ghost of a 1950s doctor named Phineas Phrag. But is Schaal going too far, trying to emulate each member of Mystery Inc?

While in Paris during Fashion Week, the gang meet up with Velma's old classmate in Criminal Psychology classes, supermodel Gigi Hadid. They are on the case of a gargoyle that is attacking Hadid's fashion show!