Little Disasters took viewers on a wild ride before revealing who was at fault for Betsey's shocking fall - and that involved multiple book to screen changes. Based on Sarah Vaughan's novel of the same name, Little Disasters, which premiered on Paramount+ on Thursday, December 11, followed an accident and emergency doctor Liz (Jo Joyner) treating an unexplained head injury on the child of one of her best friends: Jess (Diane Kruger). She then had to face the dilemma of whether to make a report to child social services. The finale revealed that Betsey's head injury wasn't caused by Jess.