In the Season 8 premiere, Monk plays bodyguard to a former child star (Elizabeth Perkins) who receives death threats after releasing a tell-all book. The job turns sour for Monk, however, after he learns she's unlike the character she played on TV.
Monk connects with a visiting African widower (Adewale Akinnuoye-Agbaje) who's investigating his wife's death. Meanwhile, Monk works on a high-profile case in which a maid's killer tended to her wounds.
Monk investigates a girl's disappearance, which seems to be linked to a UFO sighting in a small town. Daniel Stern guest stars.
Monk poses as a hit man to prevent an assassination.
A defense attorney (Jay Mohr) questions Monk's unusual investigative methods in a big murder case.
Natalie suspects that a critic (Dylan Baker) committed a murder after he condemns Julie's performance in a play, which was staged on the same night as the murder.
Area residents receive unmarked dolls that seem to predict a series of strange deaths, leading many to suspect a voodoo curse is at play. The mystery hits close to home when Natalie becomes involved. Meat Loaf guest stars.
An insurance snag leads Monk to join Dr. Bell's therapy group, which appears to have a murderer in its ranks who's targeting fellow patients.
Natalie plans a surprise birthday party for Monk, who's busy investigating a maintenance worker's strange death. Virginia Madsen and John Carroll Lynch guest star.
Sharona (Bitty Schram) returns to San Francisco to sort out legal red tape following her uncle's death. Monk suspects foul play, however, and gets a taste of working with Sharona and Natalie simultaneously. Jack Wagner guest stars.
Monk hesitantly takes in a dog whose owner has vanished, a mystery that Monk sets out to solve.
Monk and Disher go on a camping trip in order to land in the good graces of a reinstatement-committee member and his mischievous son. The trip turns perilous, however, when the group discover that nature isn't the only threat they're facing. Alex Wolff and Wade Williams guest star.
Monk is on the hunt for someone who's trying to sabotage the wedding of someone close to him. Teri Polo and Carol Kane guest star.
After rejoining the force, Monk hunts for a serial killer, a case he finds more challenging than he anticipated. Brooke Adams (star Tony Shalhoub's wife) guest stars.
Part 1 of 2. Monk returns to the place where he first heard about Trudy's murder and kicks off an investigation of great significance. Casper Van Dien guest stars.
Conclusion. In the series finale, Monk hunts down Trudy's killer.