"Just after World War 2, Superintendent Sandra Maxwell of the Special Branch, checks if a suspicious death in Glasgow is linked to Aquila, a German spy organisation, that flourished in the UK during the war.
She finds that Aquila has now morphed into a sinister new organisation. Can she and her colleagues in London catch the killer by chasing him across Holland and Germany, capture the head of the organisation, and smash their new activities before they spread to every major UK city?"