 CSI Nick Stokes investigates a murder of a family in a house outside Las Vegas city. In the house there is evidence of violence, blood and gun firing. The rest of the team thinks that the entire family was murdered, but Nick has the feeling that the little girl, Cassie, is still alive. So they start investigating and discovering the motive why the family was murdered (an illegal green house full of pot) and a chew gum in every place they go for searching clues. So Nick believes that Cassie left them a trace of gum, gum drops.