Susan forgives Red for his affair but he still has to deal with the rising death toll in the hospital as Sal Meti, his principal suspect, who had a grudge against Tierney, is killed, as is Sal's wife in an attempt to make it look like suicide. Then Ian Fleet, Kate's adoptive father with whom she had never had a good relationship, is also murdered. Whilst the team have been assuming that the victims had a connection to each other through the prison Red now believes that the link is Kate, as she had had public rows and difficult dealings with each victim and surmises that somebody is out to avenge her for wrongs done. In an effort to draw the murderer out into the open Red sets himself up as the next likely victim by having Kate arrested.
—don @ minifie-1