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Game Without Rules is written by Michael Gilbert and published by House of Stratus. It's available with International Standard Book Number or ISBN identification 0755132289 (ISBN 10) and 9780755132287 (ISBN 13).
Mr. Calder lives with a golden deerhound named Rasselas. Mr. Behrens keeps bees. No one would suspect the pair are in fact agents and often tasked with jobs that no one else can take on. They are dangerous. Their adventures in this series of thrillers show the author to have a clear grasp of counterintelligence operations.