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Love That Spy! was published by Lancer Books in 1968. According to John’s half-sister Cheryl, John wrote it, under the name T. A. Waters. However, Waters was a real person with several books to his credit; and, according to Jim Steinmeyer, who knew him, wrote them himself.
So who was responsible for Love that Spy!?
I found a copy through an online book service, and sat down with it. It didn’t take long to read. It’s a generic spy-and-sex adventure, 141 pages long, and obviously modeled on the James Bond books, then at the height of their popularity. In it, secret agent Sean Patrick travels from London to Greenwich Village to Berlin, battling bad guys, bedding women, and brandishing gimmicky gadgets. It could have been written by any professional writer in 1968.
John and Waters might have known one another — both were regulars at L.A.’s Magic Castle. Maybe they worked on it together; maybe John helped Waters. I have no idea. But I’ll mention it here, anyway; I think John would have enjoyed the confusion.