Jane and Maura's relaxing day at an outdoor spa is anything but when they discover the murder of a pregnant woman serving as a surrogate mother. Soon the hunt is on to find the baby's biological parents.

Jane and the team investigate what appears to be a modern-day witch hunt in Salem. Meanwhile, Frankie's old girlfriend returns to town with a surprise, and Jane has no problem speaking her mind about the situation.

When a young dockworker is found dead, the team discovers that there are mob connections; Jane tries to avoid sensitivity training; Maura starts spending time with Jane's brother.

Boston Homicide teams up with the FBI after a bank manager is shot during a robbery. Jane’s brother Tommy may be facing more trouble just as his relationship with Maura begins to grow. Tessa Thompson guest-stars as by-the-book FBI Agent Anna Farrell, who has a complicated history with Detective Frost.