Monk is called to a murder at the location where he first heard of his wife's murder, and while Monk figures out who the assassin is, he doesn't know that the one who ordered the hit is also responsible for the death of Trudy. Knowing that Monk will eventually put all the pieces together, he orders Monk's death, and when all hope seems lost, Monk discovers something which could finally end his 12-year nightmare.

After listening to Trudy's last message, Monk finally discovers who killed his wife. Racing against time before he dies of poison, he must make a fateful decision.