Detective Chief Inspector Tom Stone was very worried. Although he had just returned from a well-deserved holiday, after helping to solve one of the country's highest profile murder cases, he suspected that his recent feeling of both personal and professional contentment would soon be shattered. He was convinced that there was an informant amongst his colleagues, who had been systematically passing information to one of London's most notorious criminal gangs. The problem was that he had no hard evidence to back up his suspicions. Now that he had returned he was eager to find out whether or...