Murderers is author Jeffrey Hatcher’s blanket title for his trio of monologues suggesting Twilight Zone episodes written by O. Henry, and in its current presentation at Moline’s new Black Box Theatre, our first sight is of monologuists Brent Tubbs, Nancy Teerlinck, and Lora Adams standing in a row, each in turn stating, “I am a murderer.” So give director Adams’ production honesty points right off the bat, because for 100 minutes on January 28, these three actors positively killed.