Jack Karch – also known as "Jack of Spades" – is a private investigator in Las Vegas, and the son of Vincent Grimaldi.
In 1994, he was tipped by Jersey Paltz that Max Freeling had targeted a guest at the Cleopatra Casino and Resort, and arranged a sting operation that resulted in Freeling's death.
In late 1999, he was called in by Grimaldi to investigate the death of Manuel Hidalgo, which he discovered was connected to Cassie Black by way of Paltz. He tracked Black to Los Angeles through Paltz's connection to Leo Renfro, and attempted to retrieve a briefcase of money taken from Hidalgo by Black. When Cassie escaped, Karch kidnapped Black's daughter Jodie Shaw and took the girl to suite 2001 of the Cleopatra where he arranged to trade the child for the money.