The team solves three separate murders which occur on Valentine's Day. The CSI team and detectives all have their own valentine's celebrations.

Cast: Gary Sinise, Sela Ward, Carmine Giovinazzo, Anna Belknap, Robert Joy, A.J. Buckley, Hill Harper, Eddie Cahill, Wayne Bastrup, Shanna Collins, Clint Culp, Megan Dodds, Omar J. Dorsey, Georgie Flores, Josh Groban