esse and colleagues receive an anonymous letter containing pieces of a murder scene & target's photograph, made by the left-behind remote control weapon's visor. Eric returns to CSI full-time. The victim's widower receives the clue to a next murder. The prime suspect was exposed by the first victim for cheating in a Dade university research project and fired by a panel. The panel seems to have comprised the other targets, one of which is chemically burned while under Boavista's protection. But she has a perfect alibi and the last crime strikes CSI HQ.

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