Todd's Guardians by C. Edgar North

Todd's Guardians by C. Edgar North - book promotion sites
https://www.amazon.com/gp/product/B09Y7GV9VP

This book is on sale on Amazon for $2.99 (regularly $4.99) 6/18/2022 - 7/3/2022!

Todd Harris has a death wish. The story is set in wild and exotic Thailand in the late 1970's shortly after the Viet Nam war. Todd, recovering from a serious bout of cancer and depressed from breaking up with his girl friend, accepts a lectureship in Thailand  seeking a change. As he is a genius and considered one of America's national assets for design of nuclear bombs, he is closely watched by the CIA.

His presence in Thailand hatches a plot by the Pakistan intelligence service to  kidnap Todd and grill him for bomb development secrets - much to the delight of the CIA who plan to use the situation to set back Pakistan's nuclear bomb development program.