David Jansen gives a bravura performance as a police sergeant who gets tagged with a "Mad Dog" label after a stakeout turns into what appears to be a bad shoot. Ed Begley is terrific as the boss. Sam Wanamaker gives a convincingly cold-blooded performance. Steve Allen has fun as a blowhard newsman who selects Jansen as his target du jour. Lots of interesting twists, appropriately downbeat music, sharp-edged dialogue, and taut direction by Buzz Kulik make this one of my favorite mysteries of the 1960's, right up there with Harper and Wait Until Dark.