A psychotic madman with a penchant for sadistic riddles and impossible timelines corrals three unsuspecting individuals into a deadly game in which death draws closer with every second in director Robby Henson's dark, labyrinthine thriller. When the mysterious serial killer known as the Riddle Killer orders naïve seminary student Kevin Parson (Marc Blucas) to confess an unknown sin from his past, the clock soon begins to tick for this future man of the cloth. Fortunately for Kevin, police profiler Jennifer Peters (Justine Waddell) is determined to capture the elusive murderer before he strikes again. A well-known author who specializes in the subject of serial killers, Jennifer was scarred for life when she was previously targeted by the Riddle Killer and forced to watch as her brother was brutally murdered right before her eyes. As Jennifer and Kevin join forces to catch the Riddle Killer and end his murderous killing spree, Kevin's childhood friend Samantha (Laura Jordan) -- a former FBI agent-turned-insurance investigator -- returns to protect her friend, even if it means risking her own life. Now, with the minutes ticking away as Kevin struggles to recall the childhood sin that threatens to bring about his untimely demise, the three desperate souls journey into a grim world where your closest friend could be your worst enemy.