Angela's team is stymied in their investigation of a wealthy socialite suspected of murdering an intruder, when he takes refuge in a church. Meanwhile, Angela's brother talks her into paying a visit to the mother she hasn't seen in years, who is dying.

The team tries to derail a father-and-son crime team's plan to rob a sports arena. Meanwhile, Angela finds out that her dying mother could survive if she gets a bone-marrow transplant.

Leo is particularly affected by the unit's search for a missing girl. Meanwhile, Angela discovers more about the relationship between her mother and her boss.

Angela arranges for her brother Jerry to meet her boyfriend Dylan, but things are interrupted by a shooting involving an unexpected visitor from her past. Leo and Dozer hunt for the gunman with their only clue being the code word "bluebird," a reference to her first case with the FBI. Meanwhile, flashbacks reveal how Angela was recruited to join the bureau.

The team goes into action to help rescue Dozer, whose flight to Los Angeles has been hijacked. Meanwhile, Angela encounters her former boyfriend Peter, and finds out that her mother once had breast cancer.