Dr. Tom's propensity for using his work to hide from his personal demons explodes when a long-lost, primal part of his past returns. Unfortunately, his feelings of utter helplessness cause him to erupt in rage at Erica, threatening their close-knit relationship. At the same time, Erica is forced to decide how far to take things when Kai returns on a regret and Sam continues struggling with her intensely desired, but professionally disparate, affair with Lenin.