Anna and Diana square off in the dark bowels of the Mothership – Diana has been down there for 15 years and not had a single glimpse of Anna. Meanwhile, Erica has Tyler’s blood analyzed, and learns the V’s did something sinister to her when she was pregnant with him.
Castle and Beckett investigate the murder of the owner of a historic magic shop found dead in a Houdini’s water torture tank. Meanwhile, Lanie and Esposito are trying to keep their relationship secret and Castle ends his relationship with Gina.
Emily seeks Cal’s help for her friend who is worried about her dad, who has been in a psychiatric facility for 5 years. Cal is immediately suspicious of the facility and puts his own sanity on the line when he gets himself committed so that he can work the case from the inside.
A wealthy woman asks Cal to check out her new boyfriend when her son discovers a briefcase filled with cash and a notebook in code.
Patrick and the team investigate the murder of a woman with ties to one of the fighters. Meanwhile, LaRoche focuses his investigation on Rigsby, who in turn is forced to ask Cho for a huge favor in order to keep his job.
Claire becomes a vigilante to catch a car that speeds though their streets. Phil tries to land an important listing with a difficult client, Jay teaches Manny (and Gloria) how to ride a bike. Mitchell and Cameron meet a mysterious neighbor who is quite the charmer.
After years of being at their kids’ beck-and-call and never having time for themselves, Frankie and Mike decide to take charge of their lives and regain control over the Heck household. But Axl, Sue and Brick don’t plan on going down without a fight.
Amanda tries to get more information from Clarice, but can’t get close enough. In order to provide her with the equipment to do so, Duram would have to give her up as his CI, a dangerous confession given the possible leak within the department.
As the Adama brothers rise to new positions in the Ha’la’tha, they are haunted by the mission of their late parents and the different direction the Guatrau is taking them. Daniel hopes to use this with Sam by offering Cylons for Tauron, in exchange for refraining to carry out the ordered hit.
As the “Avenging Angels” change code inside New Cap City, Daniel is able to track them down, but an early snafu in trying to reach out to Zoe leave the Graystones to enter the game only under its strict rules. With only one chance, Daniel asks help from Sam who has no interest in disturbing his brother’s peace of mind.