That is the question the CSIs must ask themselves in this episode. After finally getting a warrant for the suspects, they enter the house only to find them dead. Two undercover officers were watching the house and suspicion falls on them but they say that they were called to a officer down. They are cleared and as they collect evidence, they begin to suspect another cop. Why because they found his jacket and badge in a drain. It is never a walk in the park for the CSIs so of course it can't be that simple.
We also see Sara and Catherine investigate the death of a college kid, who was a die hard sports fan, in his bath.
It was a good episode and was the better part of the two episodes.