The core trio of investigators, Mabel, Charles, and Oliver, portrayed by Selena Gomez, Steve Martin, and Martin Short, respectively, are confirmed to return for the next season. Despite the heartbreaking loss of Sazz in season three, Amy Sedaris is set to make a return, possibly through flashbacks.
Meryl Streep, who joined the cast in season three, will reprise her role as Loretta Durkin, the love interest to Oliver Putnam. The season concluded with Loretta receiving an offer to work in Los Angeles, paving the way for new narrative possibilities.
Excitingly, Molly Shannon has been announced as a new addition to the cast for season four, portraying a high-powered businesswoman from Los Angeles drawn into Sazz's murder investigation in New York.