Frankie comes up with a plan to stay on top of her kids’ schedules; Brick’s new teacher (Doris Roberts) accuses Frankie of being overprotective.

Beckett and her team burst into an apartment on a murderer’s trail, just to be surprised when they see Castle, who they haven’t heard or seen in months, standing over a dead woman’s body holding a gun. Beckett, has no other choice but to arrest Castle until he proves his innocence.

When Ted and Barney argue about who has “dibs” on a hot girl, Ted realizes that she is there with Cindy, a girl he previously dated who is also the roommate of his future wife. Meanwhile, Robin is heartbroken over Don, and Marshall can’t keep quiet about his desire to start a family.

When Mrs. Frederic is stricken ill, the agents must search for a cure before it’s too late. Their quest takes them to Egypt and the long-lost Warehouse 2.

After Cal’s journalist friend, Julie, is murdered over an investigative piece she was writing on political corruption in Baltimore, Cal decides his team should continue her work and finish the story.

When Peter and Neal find a vital clue in the mystery of who killed Kate, Neal orchestrates an elaborate con to bring himself face to face with her murderer.

Someone is using Artie’s artifacts to commit a series of murders.

A distraught father comes to Cal for help finding his 18 year old daughter who disappeared and then turned up in a porn movie. Meanwhile, Cal pits Eli and Ria against each other as they vie for the same promotion.

The gang begins seeing visions of people from their pasts, while the town seems to be collapsing around them. Meanwhile, Dr. Grant gets involved with a mysterious faction.

The agents hope to spend a weekend relaxing until an artifact gets in the way.