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The Proteus Pact by Geoffrey St. George (pseudonym), 1975.
I bought the book 30 later and it still fascinates me.
Anyone remember the book, know about the author, did
he/she wrote more novels?
Doing a quick Google, that book is the only one I can find by him. If it's a pseudonym, I don't see it anywhere--but admittedly I only searched for about 2 minutes. :)