In the first sequel, "Whip Hand", Halley has been fitted with an artificial left hand. He and his partner, Chico Barnes, no longer working for Hunt Radnor Associates, have opened their own detective agency, and, in quick succession, are hired to investigate three unrelated cases. In the course of this novel, Halley is threatened with the loss of his remaining hand. "Whip Hand" won both the MWA Edgar and the CWA Gold Dagger for Best Novel, one of only two novels ever to win both awards, the other being John le Carré's "The Spy Who Came in from the Cold".