James Huang

When a web celebrity is murdered, Castle and Beckett explore the flashy world of internet fame. But when the killer posts pictures from the crime scene on a photo-sharing site, they realize they are up against a social media sociopath who may strike again.

With Josh's life on the line, Eve traverses the dangerous wilderness back to the clearing to save him; desperate to kickstart a rescue mission, Gavin and Izzy work to prove survivors are alive inside the sinkhole as government agents track them.

A power play ensues between Jack and the Others; Juliet's future hangs in the balance; Kate, Sawyer and Karl continue their journey away from "Alcatraz."