Killers target the Boston homicide headquarters, trapping Jane, Maura and Frankie Jr. in a fight for their survival.
Hannah tries to process an untimely death; Jessa tracks down an old friend; Marnie discovers a video that Charlie posted online.
Detective Carter faces fallout from her encounter with Reese and Finch; the machine comes up with not one, but four Social Security numbers.
Christian agrees with Ava to operate on baby Raphael in exchange for her to stay out of Matt's life who has abandoned everyone to be with Ava.
Secrets are revealed and past pains are uncovered as Sean and Christian begin psychotherapy together; Matt and Liz divulge their own confidences when they each join a therapy session.
