While pretending to be a drug addict, Dexter gets an N.A. sponsor to please Rita. But when the sponsor turns out to be a beautiful woman who may have more in common with Dexter, Rita is not happy. Things get worse for Rita when her estranged mother comes for a visit. Meanwhile, Dexter must find a way to lead the all-too-smart FBI Agent Lundy, now working with Miami Metro PD, off his trail.