Monk is committed to an asylum, where he becomes convinced the chief psychiatrist committed a murder several years prior.

Renowned philanthropist Henry Rutherford is killed when a minor earthquake rocks the city and sends a display case falling on top of him. But when Monk examines the scene, he finds clues that suggest foul play.

When English teacher Beth Landow falls from the clock tower at Trudy's former high school, the assistant principal doubts the police department's conclusion that the death was a suicide and invites Monk to investigate. Monk quickly concludes that the suicide note is a forgery: a highly respected English teacher wouldn't confuse ""its"" with ""it's."" A few words with the teachers in the lounge lead him to suspect that the murderer is a science teacher, Derek Philby. Unfortunately for Monk, Philby was proctoring an SAT exam when Ms. Landow's body landed on Philby's car, setting off his car alarm and alerting the entire school to her death. Armed with a strong suspicion but no evidence, Monk becomes a substitute teacher in hopes of finding the information that will incriminate Philby, who arrogantly informs him that he's ""failing the class""--he has no evidence to support his hypothesis. Faced with students who throw erasers at him, an irate father who is also the school's gym teacher threat

When Monk's paperboy is murdered on his doorstep by a guy looking to steal his newspapers, Monk turns to the pages of the newspaper for clues to solve the baffling crime.

After a phone call from Lt. Disher, Monk and Sharona find him in Captain Stottlemeyer's office, drinking Scotch to console himself because his 58-year-old mother has married a 37-year-old antique dealer he's sure is up to no good. The con man, Dalton Padron, has taken his aging bride to a marriage counseling clinic for their honeymoon, and Sharona persuades Monk that the best way to catch him is to pose as husband and wife and join him at the clinic. In a group therapy session, Sharona accuses Padron of winking at her and, in the scuffle that follows, snatches an old letter from his jacket pocket. The letter confirms their suspicions: Padron is after the gold that was stashed away 150 years earlier by the crazy old prospector who once owned the house. Padron later grabs the letter and burns it, but not before Monk and Sharona discover that the secret is somewhere in the hundreds of journals that the old man wrote before he died. Early the next morning, Sharona follows Padron into an ol

In yet another case of murder in a room locked from the inside, a music producer is found dead with bullets in his back, head. and chest, clearly neither an accident nor a suicide. But this time there's a further twist: the dead man's pet chimpanzee, Darwin, is caught with the murder weapon in his hand. Not wanting to make a monkey of himself by falsely accusing a chimpanzee of murder, Stottlemeyer takes the chimp into the interrogation room, tempting the animal to fire what he thinks is an empty gun. Meanwhile, Disher realizes that he's inadvertently given the captain a loaded gun and panic ensues. When the gun goes off, endangering not only Stottlemeyer but Disher, Monk, and Sharona as well, Stottlemeyer is persuaded that the chimp is guilty and is ready to allow animal control to put him to sleep. Sharona, however, is convinced that Darwin is innocent. In desperation, Sharona resorts to breaking and entering to rescue Darwin, persuading the most unlikely person imaginable to take hi

Is Monk hallucinating or is he really seeing Trudy?

When an officer dies after drinking poisoned wine sent to Captain Stottlemeyer as a Christmas gift, the captain suspects Frank Prager, who tried to shoot him outside a bar several months earlier. Searching the crime scene for clues, Monk notes that the bullet holes seem to form a pattern, but neither he nor Stottlemeyer can figure out the message they're intended to convey. After trying unsuccessfully to talk with Prager's young daughter, Monk goes under cover as Santa Claus. This time he learns that Prager is hiding in a church with ""three ladies"" in front of it. But when Prager is caught and interrogated, it's clear that he had nothing to do with the poisoned wine. With the other suspects on Disher's list also eliminated, Monk and the captain are back to square one. But when Monk opens the card accompanying his gift from the Christmas party, he finds the clue that solves the case.

When Captain Stottlemeyer suspects that a suicide is really a murder, Monk confirms his suspicions by discovering that the victim, Joanne Raphelson, was too short to have used the stool she supposedly stood on to hang herself. But the next clue, the remains of an olive, a cherry, and a cocktail onion on a stirring stick, leads Monk to suspect that the murder was committed by an astronaut, Steve Wagner. A little research reveals a motive--Joanne was about to publish a book revealing that Wagner had abused her five years earlier. Now all Monk has to do is to prove that Wagner could commit the murder when he was in outer space.

During the investigation of an armored car heist involving the deaths of two drivers and the theft of valuable government bonds, Lt. Disher tries to convince Captain Stottlemeyer that he witnessed a murder while under anesthesia in the dentist's office. When one of the highjackers, Denny Jardeen, is found murdered, Disher insists that Jardeen is the man he saw Dr. Bloom and his assistant kill while he was sedated. Stottlemeyer still thinks that Disher was hallucinating, and Disher angrily leaves the force, deciding to revive his high school rock band, the Randy Disher Project, as an alternate means of earning his living. Meanwhile, the only clue to Jardeen's murder is two pairs of bruises each ten inches apart on the dead man's chest.

When Lt. Disher inherits a farm from an uncle who committed suicide, he decides to quit the police force and start a new life in the country. But Disher soon suspects that his uncle was murdered, so Monk joins him on the farm to investigate.

Mr. Monk takes a walk when he can't sleep, but ends up running into a murder.

When Monk's delinquent half-brother, Jack Jr., escapes from prison and breaks into Monk's apartment, he manipulates Monk into helping him find the person he claims framed him for murder.

Monk meets a visiting African widower who's determined to find the hit-and-run-driver who killed his wife near Monk's apartment. Monk begins to identify with the man and confuses his wife with Trudy.