Zoe is blindsided when her mother shows up to Beth-H unannounced, just as she's getting ready to start her shift. Zoe hasn't heard from her in twenty years - and the more she learns about her mother, the better she understands why. Allen performs a heroic emergency procedure and saves a patient's life, and must contend with the psychological aftermath. Griffin becomes overly involved when he tries to play matchmaker to a pair of love struck teenagers.