In 1995 when the body of a woman is found in Clark County, Washington, local detectives quickly apprehend long-haul Canadian-American truck driver Keith Hunter Jesperson. A series of increasingly disturbing revelations suggest Jesperson's true identity is that of the serial murderer known only by his nickname, 'The Happy Face Killer.' Detective Rick Buckner tries to outwit one of history's most demented serial killers by playing a deadly game of cat and mouse with Jesperson, aiming to prove that the truck driver is the killer they are looking for.
