The adventure that brought two intrepid cousins into the service of the department of British intelligence known as Z . . .   Desperate to escape the suffocating heat of London, cousins Mark and Mike Errol set out for Richmond for a relaxing boat ride. Little did they know their peaceful afternoon would be violently interrupted by a Department Z mission that would completely change their lives.   Quickly recruited into the secret agency, the Errols embark on one of the department's most treacherous cases. The League of the Hundred-and-One are terrorizing the people of Britain and holding the country ransom. With one hundred and one reasons to panic, can Department Z defeat this elusive league before the nation crumbles?