Blue Bloods Season 4 Episode 20 Custody Battle

Danny and Baez investigate a bitter custody battle between a couple whose divorce is being handled by Erin's friend, Karsten. The case becomes complicated when Karsten is found murdered and Erin is assigned to the case. Meanwhile, Frank tries to help out a young woman who owes money to someone in his congregation, and Jamie and Eddie attend a wedding together. As the investigation unfolds, tensions rise between Erin and Karsten's ex-husband, creating a challenging investigation for the entire Reagan family.