Though Cat may not want to admit it, she and Leo are proving to be a great team. His insight has helped her close two cases. But this week, it's Leo who ends up needing Cat's help when a dear friend is murdered.

A foster mother is murdered, prompting an investigation by Cat and Leo. Before long, Cat is surprised by the bond she forms with one of the foster children. The case turns personal for Leo, who misses his own son in France. Meanwhile, Cat asks to open a case into a mafia family.

A female inmate escapes during an attack on a transport van who turns out to be the witness to the murder of Cat's father.