When an Assistant DA is dropped from the fifth floor of a parking garage onto the street below, Castle and Beckett find his empty, single life is somewhat more busy than it appeared. When a co-worker is found to have a shady background, the DA's secrets begin to unravel. Castle's desire to help her and another person connected to the DA raises Beckett's hackles. And, in the midst of the case, Alexis comes to Beckett for advice, to the consternation of Castle, who feels concerned about her not coming to him instead.