Relentless - There's a serial killer stalking Los Angeles and only a N.Y. cop can stop him.
Relentless 2: Dead On - Sam Dietz is back and this time the serial killer has a political motive.
Relentless 3 - Sam Dietz thought all the serial killers had been caught, until he found one who escaped.
Relentless 4: Ashes to Ashes - There's a serial killer loose and he loves psychiatrists, especially the one Sam Dietz has fallen for.
