Ray and Nick discover the corpse of a boy, and several body parts. Is Dr Jekyll back? Elsewhere, a dead woman is dumped in a hotel corridor.
After a police chase results in the discovery of two bodies, the ensuing investigation uncovers dark goings-on at a strip club.
Hodges presents the 'lab rats' with a series of hypothetical murders in order to give them a chance to play CSI.
The CSIs are called to a shoot-out at a gun store involving four people. Later, a separate murder is linked to the gunfight.