Error of the Moon

From the back cover:The General Aircraft company stood on the desolate Yorkshire moors. It was the perfect spot for a secret government project ... and deadly intrigue. Missing documents pointed to espionage, but a corpse added murder most foul to the high crime of treason. Working undercover as a new employee, Antony Maitland needed all the skills he learned as a wartime agent to find the traitor. The suspects ranged from the company's director to a very private secretary, but one murder after another quickly narrowed the field. Maitland decided that it was time to set his own trap to catch the elusive killer. Though if it failed, it would be his first ... and final mistake.