There are 4 books in the The Adversary Cycle series. The newest book is Reprisal which came out in 1992.

The Keep is the first book in the Adversary Cycle from bestselling author F. Paul Wilson and the basis for the 1983 cult classic horror film written and directed by Michael Mann.

"Something is murdering my men."

Thus reads the message received from a Nazi commander stationed in a small…

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2
Reborn

Book cover of Reborn
Orphan Jim Stevens hopes to discover clues to his origins when he inherits the fortune and estate of a Nobel Prize-winning genetic researcher, but he may receive another surprise from the scientist when his wife gives birth

4
Reprisal

Book cover of Reprisal
Will Ryerson seeks a new life at a university in North Carolina, but he and the people he meets there find that they cannot get away from a web of violence, terror, and death