After a rape victim identifies her rapist, Grissom and his team struggle to find the physical evidence to convict the perpetrator when it points in a different direction.
Greased Lightning hits McKinley on the opening night of the musical. Santana, Rachel and Kurt return to Lima for the occasion, while Kitty steps up her vendetta against Marley.
Valens helps Rush search for her abducted sister; Jeffries tries to close a case that has haunted him for 17 years.
Jerry begins dating his new maid, George ponders a nickname, and Elaine has to get the new area code.
Low on cash because they haven't had a homicide to investigate in three weeks, Monk and Natalie search for the stolen Alexander Diamond, hoping to win the million-dollar reward.