Alexis enlists Castle’s help on an Innocence Review case to prove that a death row inmate, Frank Henson, was wrongly convicted. With only 72 hours left before his execution, Castle and Alexis (with help from Beckett) urgently investigate the original murder, only to uncover explosive secrets that may seal Frank’s fate.
When Robin and Loretta’s conflict escalates, Barney is caught in the middle. Meanwhile, Marshall and Daphne deal with a stowaway on their road trip, and Ted and Cassie try to enjoy a trip to a lighthouse.
Carrie turns the tables on the mastermind of the Langley bombing, but recruiting one of Iran’s most powerful operatives has dangerous consequences. Meanwhile, Saul struggles to keep an intrusive Senator Lockhart at bay, and Dana makes a radical decision that will change the Brody family forever.
Alicia and Cary represent a client who changed firms and Will and Diane delay turning over the case files. Marilyn tries to give advice to Alicia.
When Captain Gregson’s home is invaded, Holmes and Watson work to find the masked gunman before he strikes again. Meanwhile, Gregson gives his team some insight into his private life.
As Peter settles into a promoted position at the FBI, Neal has to pull off a brazen museum heist right underneath the FBI’s nose.
The team investigates Democratic Congresswoman Josie Marcus, while Olivia and Mellie have a surprising run-in during the White House Correspondents’ Dinner. Meanwhile, Jake and Huck get closer to the truth about Operation Remington, which could lead to devastating results.