It was the notation "witches spawn warlocks" on his personal dossier that marked Polish-born Anson Bolda as out of the ordinary. And *that* his assignments certainly were, even for one in his deadly line of work. Bolda's first mission to Poland, his release from a Soviet prison, his response to a "Help Wanted" ad in a newspaper are all links in a chain of wild adventure and danger. It is a chain that leads from Gdansk, to Moscow, to Washington, and finally to the apartment of a strange old man in St. Louis... and an ending that will leave the reader gasping with surprise.
Arthur Wilson "Bob" Tucker was an American mystery, action adventure, and science fiction writer, who wrote as Wilson Tucker.
He was also a prominent member of science fiction fandom, who wrote extensively for fanzines under the name Bob Tucker, a family nickname bestowed in childhood.
I first read this book back in the 1970s. It's a somewhat convoluted thriller of its time, and I read it front-to-back in an evening. I am a big fan of Wilson Tucker's work. I bought the paperback first, then tracked down a hardcover for my library. I've loaned the pb out several times to friends/relatives and they've said they liked it a lot.
Some people have said there is a vague supernatural element to this work, but I can't say that I remember it.