Harry Perry

Maura and Jane fly to LA to probe a murder linked to another case in Boston.

Grissom and Sara investigate the murder of a psychiatric-hospital patient and quickly narrow the suspects to several patients and staff members.

The new and different Sylar pays Matt a visit; Peter tries to warn Emma that Samuel isn't what he seems; Noah begins his plan to infiltrate the carnival and capture Samuel.

Sylar starts to find his true identity, and Peter and HRG go on a quest to find someone that can save Hiro.

As Noah hosts a thanksgiving dinner, an unexpected guest visits the Petrellis. Meanwhile, Lydia tries to discover the truth about one of the carnival's secrets.

As Noah's life hangs in the balance, Samuel prepares to kill thousands and Peter and the others must band together to stop him and save Emma.