Preston, Douglas & Child, Lincoln: Reliquary

A sequel to 'Relic' featuring the same major characters dealing with an apparent recurrence of the same type of killings that featured in the earlier novel. As well as the scientific details which one takes on trust, the actual location is as much below the surface of New York as on it; this is a reflection of the actual reality with references to non-fictional source material. Although it is still a cerebral puzzle, much of the book deals with the physical both in respect to the chapters dealing with below ground and to the scenes above ground, especially the depiction of the protest march and its aftermath. Lengthy but enjoyable.