Adrian Monk: Here's what happened. A month ago, Sharona wrote a murder mystery about a woman who kills her husband using a virtually untraceable poison. The story was a blueprint for a perfect murder, exactly what Meredith and her lover were looking for. But they had a problem. If they stole her idea, after he died, Sharona might become suspicious. Somehow they had to discredit her in advance before the murder.
Captain Stottlemeyer: So nobody would believe her.
Adrian Monk: Exactly. So Sharona started seeing things.
Lieutenant Disher: Like dead people.
Adrian Monk: And losing things.
Sharona: Yeah, they must have stolen the keys from my purse and made copies of them, and that's how they got into my house and moved everything around.