On Halloween, Monk visits his brother Ambrose in his childhood home to await a visit from his long-absent father, but things take a strange turn when a masked trick-or-treater repeatedly tries to steal Halloween candy.
When Natalie finally catches up with the pizza guy who mistakenly left her $50 in change, she finds him dead in his car. She feels compelled to solve the murder but Monk, sick in bed, offers little help.
Cassie gives a withdrawn traveling artist a new paintbrush and invites him to stay at Grey House; Cassie arranges for her and Sam to organize the Tri-Cities Healthfest, something that Cassie usually does by herself.
Cassie decides to plan a surprise party for Sam to celebrate the anniversary of his move to Middleton; Grace uses her powers to create situations where she and Noah can get together, but Nick keeps getting in the way.
When planning her cousin's wedding goes awry, Jess turns to an unexpected source-her mother, Megan-for help. An O'Brien family wedding has some unexpected tension when Mick is confronted by an adversary from his past.
Attorney Claire Darrow defends an old colleague of her mother's for murder. Things get complex when Claire's romantic interest, Miles, is named as prosecuting attorney on the case. Starring Kimberly Williams-Paisley, Tom Cavanagh.
A taunting clue left for Aurora at a meeting begins a cat-and-mouse game between her and a mysterious criminal who commits increasingly serious crimes that leave the town rattled. Candace Cameron Bure, Niall Matter, Marilu Henner.