Here are some of my ideas!!
Mr. Monk makes a Bet: When Monk thinks it's one culprit and Disher, natalie, and Stottlemeyer think it's another culprit, Monk makes a bet with them to prove he's right.
Mr. Monk and The Rockclimber: Monk investiagtes the murder of a rockclimber.
Mr. Monk and the Return of Sharona: Sharona returns and asks Monk to investiagte a murder that she witnessed.
Mr. Monk goes Bowling: Monk investiagtes the murder of an employee at a bowling alley and must become part of a tournament to get more answers.