Two separate murders challenge MIT's investigative skills when a tramp is found floating in a lake, and a teacher is ushered out of the window of his flat. As the investigation continues, there appears to be a connection.

The decomposed body of a woman with red hair sends MIT on the search for a possible serial killer. When another red-head is found alive, but in bad shape, the officers find more clues that give them a chance at stopping the murderer for good.

A convicted pedophile is murdered in his own home.