Shayne and Lucy Hamilton are the primary recurring characters appearing in this story. Shayne is tough and relentless, but here is also sensitive to the problems of these disturbed twins.

Confused by their visions and uncertainties, he himself becomes uncertain of truth and reality at one point. He is also strongly concerned for Lucy's well-being at this point.

Lucy here is Shayne's helper and more clearly his girlfriend. Lt. Caron Thurman is a policewoman who actively pursues Shayne as they work together on the case and there is friction between Lucy and Caron. Shayne recognizes Lucy's right to her hostility because of their "relationship."