TJ's christening turns grim when a body is discovered in the church. Jane almost abuses her power in order to protect Tommy when Lydia's fiancé, Stuart Stawbridge threatens to take custody of TJ, and budget cuts cause tensions to run high around the department.

On the first day of Paddy's murder trial, Maura gains insight into her father from Hope. Korsak opens up about Cavanaugh's tragic past. And in an unexpected twist, Maura must decide which side she's on when she and Jane unravel a shocking secret about Paddy and Hope that affects them all.