A drugs transport to incineration is attacked by a well-armed gang, but a woman shouting for help for her baby rather distracts Horatio and Speed, whose gun is jammed, but a bullet-proof vest saves his life. Only SWAT sergeant Hollis is killed, but as ballistics later establishes from a distant spot. Horatio finds the woman isn't the baby's mother, she was hired by a drugs gang. CSI is suspected of tipping them off, especially after Calleigh tests positive for cocaine, but Horatio traces that to a nearby spot suitable for the sniper. The fiends even left one of their own, badly wounded Lester Cassidy, behind to die in Paul Tomassi's workshop after consulting suspended MD Guillermo Santoyo.