Jon Briddell

When an 8-year-old is found dead on the Appalachian Trail, the team searches the forests for a man targeting children.

Torres is forced to revisit her troubled past when her half-sister is incarcerated in a juvenile corrections facility.

Nic and Conrad decide to admit a homeless Jane Doe; Devon and Irving care for a male escort who offers surprisingly good advice; Micah returns for a checkup and falls even harder for Mina; Devon's parents are in town.

After all the guests attending an upscale fundraising soirée for the science department at a local university fall ill, the CSI team gears up to investigate; Catherine enlists Grace's roommate to help her find clues after Grace disappears.

The big night of the gala has arrived, but nothing goes as planned for Birdie, Catherine, Brett and Alice.

Ben's attic discovery adds to the tension between him and Christy -- who is still keeping the kids away from him; unwilling to just wait for the evidence to be re-tested, Cornell returns to the crime scene in hope of finding something new.