Kendig is a CIA agent (the best who ever did it) who's retired after being forced into taking a desk job. He soon discovers that life has no meaning for him without the game of espionage, so he decides to play again. How? By making the CIA come after him to retire him permanently. That is, if they can catch him. So he writes a tell-all book about the CIA and sends chapters to all the major publishers, worldwide. However, he withholds all the corroborating evidence, with assurances that he'll send it along to the highest bidder. He also sends the chapters to the CIA.
Naturally the agency can't allow the book to be published, so the hopscotch game begins. The agency puts the current best man on the case, with Kendig hopping around the globe, leaving clues so that the game stays interesting for him.
Hopscotch is fine lightweight entertainment. Kendig's schemes work perfectly, and he manages to stay one step ahead of the agency, up until the last 1/3 of the book, when things begin to get a little dicey for him just as he'd decided that he wants to go on living, after all. Along the way there are some amusing comments on publishing, the CIA, the FBI, and other things. Lots of fun.