Rosewood (or Rosie to friends) is asked by his mother to investigate the suspicious death of one of her top students, since the police can't find any evidence of foul play.

Captain Hornstock forces Villa to pick a new partner.

A local musician dies in his studio with no discernable cause of death, stumping Villa and Rosewood; Donna asks Mitchie to look into Erica's missing year.

The murder of an ATF agent who was working undercover turns out to be connected to a cold case that leads to a number of suprises for Rosewood and Villa.

A former girlfriend asks Rosewood for help to find a missing patient which turns up as a body. Rosie faces decisions about all the women in his life.

Rosie and Villa are caught in the middle of an explosive investigation; Rosie discovers information that forces him to start his own investigation behind Villa's back; Donna's behavior indicates she may have a new man in her life.