MEDIUM – “A Person of Interest” (Season 5 Episode 3) February 14, 2009 Medium Watch a sneak peek of Medium‘s Season 5 Episode 3 “A Person of Interest” airing Monday Feb 16 (8-9 p.m. ET). Read all our Medium coverage here. Episode Synopsis: “A Person of Interest” – After visiting a crime scene, Allison’s (Emmy winner Patricia Arquette) unusual behavior puts her family at risk, but may be the key to solving a 17-year-old crime. Meanwhile, Joe extends a dinner invitation to his new colleague (guest star Kevin Corrigan, “The Departedâ€), but things take a surprising turn. Miguel Sandoval, David Cubitt, Sofia Vassilieva, Maria Lark and Madison & Miranda Carabello also star. Show Cast: Sofia Vassilieva, Maria Lark, David Cubitt, Jake Weber, Patricia Arquette, Miguel Sandoval (Photos: Michael Yarish) Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pocket (Opens in new window)