Plot summary
Two women are found dead with an apparent drug overdose, in similar positions with a syringe in the left arm; Don suspects a serial killer. The investigation reveals valium ( diazepam ) and morphine. Charlie's help on Don's case is hindered by his bizarre dream about his mother ( JoBeth Williams appears as Margaret Eppes). Sam Trammell and Olympia Dukakis also guest star. Mathematics used: Directed graph, parabolic equations, probability and trajectory
Credits
Adapted from Wikipedia contributors, Numbers season 2. HTML formatting and reference markers removed.