The best mysteries--whether detective, historical, police procedural, cozy, or comedy--have one thing in common: a memorable perpetrator. For every Sherlock Holmes or Sam Spade in noble pursuit, there's a Count Dracula, a Lester Leith, or a Jimmy Valentine. These are the rogues and villains who haunt our imaginations--and who often have more in common with their heroic counterparts than we might expect. Now, for the first time ever, Otto Penzler gathers the iconic traitors, thieves, con men, sociopaths, and killers who have crept through the mystery canon over the past 150 years, captivating and horrifying readers in equal measure.