Barely three weeks after catching the killer of Erin's mother and their biology teacher, Erin and her crew are back, up to their elbows in forensics projects. But this time it's with the full approval of their parents.

With Uncle Victor at the helm, Erin and her best friends, Spam and Lysa, are prepping a new classroom for CSI summer camp, where they will serve as camp counselors. Meanwhile, Erin's super-hot new boyfriend, Journey, is graduating, just in time for him to take a position as Victor's intern in the new CSI lab on campus. Journey and Victor are going to take another look at the evidence in the murder trial that sent Journey's father to prison. The girls are under strict orders not to meddle with the murder case, but that's easier said than done...