The episode "The Book of Charles," set to debut on April 1, will reveal that Dr. Daniel Charles is struggling with his mental health and revelations about his family legacy. The revelation comes after a harrowing call from a suicide hotline. Showrunner Allen MacDonald revealed that the series has been using a lot of pieces of the puzzle to depict the character's family history, including his parents, Annabelle, and his daughter, who attempted suicide last season. Platt, an original cast member on the show, expressed his excitement about the upcoming episode and the show's progression towards a 12th season.