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.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Maura throws a goodbye party for Tommy since he has gotten a new apartment and is moving out of her house. The next day a bank is robbed and a man is gunned down as the killer is about to leave. When the van that was used in the robbery is found, the dead body of one of the robbers is in it, along with fingerprints matching Tommy, who is arrested.