Detective Marshall Underwood works for a small detective firm currently investigating a case of serial murders. On one particular day, his whole career path takes a complete turn when he gets mistaken for a defense attorney. After winning a case, he’s practically famous, and gets several clients asking for a defense a day. While not having a law degree, Underwood can’t help but accept the cases. He now must defend clients while also trying to figure out the serial killer behind the mysterious string of killings going on in London.