Once wealthy teenage boy whose family has fallen on hard times is found dead in a rowboat floating along the lake in Central Park. As Castle and Beckett try to piece together the events leading up to his death, his friends do everything in their power to thwart the investigation. As they unravel the truth from the lies, a story of betrayal and obsession emerges. Meanwhile, Castle debates whether he can leave Martha home alone while he chaperones Alexis' class trip to Washington, DC. Martha might be an aspiring "Life Coach," but that doesn't mean she's trustworthy.