 Throughout most of the rest of the series Halley struggles to come to terms with the loss of his hand, and to master the prosthetic device that has replaced it.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.