Justine’s boyfriend, Kurt Wilson, was the prime suspect her murder. Anne was looking into the case. Footage from her video camera shows her being attacked in the woods by an unidentifiable figure. Castle still thinks it could be Bigfoot. He makes Sasquatch-like sounds to draw the beast out during a search of the woods where Anne was initially attacked. Castle and Beckett fall into a pit trap in the ground. She’s able to climb out to go get a rope. Castle thinks Beckett has returned when he hears noise from above. Unfortunately, it’s someone a lot hairier than his partner. Castle has come face-to-face with Bigfoot!
Beckett draws her gun on Bigfoot, who falls backwards into the pit. Castle wants her to shoot the beast until he realizes it’s Dr. Darrell Meeks in disguise. He leads them to the spot where Anne was killed. He stumbled across the murder weapon while on his Bigfoot hunt. Back in the city, Ryan and Esposito track down Kurt Wilson. He was living in the woods where Anne was attacked. She was trying to help him because she believed he was innocent of her roommate’s murder. Kurt leads Castle and Beckett to the real killer, the serial stalker former professor, Dr. Paul Devlin. Anne knew he was a murderer when she saw him with Justine’s pendant. Case closed.
Castle and Beckett have a nice discussion about their beliefs. She’s all about everyday magic like nature and John Coltrane. Castle appreciates that which is possible and unknown. Beckett believes in one unexplained phenomenon: the two of them. This sweet declaration is interrupted when Castle’s booby trap catches his food thief red-handed. Actually, Alexis is caught blue-faced thanks to a dye pack. She admits she blew her allowance investing in a friend’s idea to help clean the air via bamboo forests atop skyscrapers. Castle wants to know more about this wild idea. After all, he’s a big fan of that which is possible.