Definitely an odd book by Wilson, and although billed as the third in the Adversary Cycle, there is no connection between the first three books whatsoever. Our main lead, Alan Bulmer, is a G.P. practicing in a small Long Island town. He has his own practice, but also works some evenings at a local hospital. One day he encounters a very ragged man in the E.R. who seems to know him, but Alan is sure he never saw him before. To avoid a bigger scene, Alan goes over to him and the guy grabs him and gives him something like an electric shock, and then dies.
From the cover blurb, we know this will be a story about a man who can heal people of just about whatever via simply touching them (hence the title). Alan discovers that he has the touch one day when examining a long term patient, he feels a euphoric shock and the patient is suddenly cured of her hearing loss (among other things). Via ample foreshadowing, we know that Alan will pay a price for using his healing ability; we soon find out that each time he heals someone, a little bit of his brain dies...
There is a fair amount of cloak and dagger action here, with a senator literally dying to find a cure to his degenerative disease who sets his sites on Alan, but I will not go into that here.
This is pretty tame for Wilson, and not really a horror novel, although being published in 1986 was billed as such (e.g., the paperback from hell decade). To really enjoy this one, I think you would have to have some empathy with the characters, but they did not do much for me. More of a meh than anything else. Decently written, you could do worse. 2.5 stars, rounding up.