In February 1944, the girls of the Air Transport Auxiliary Mystery Club face the devastating personal loss of one of their own in a tragic crash. At the same time, another member is blackmailed, whilst honeymoon plans of a third are threatened by a puzzling mystery. As they share each other's joys and troubles, the friends find the comfort and strength to go on with their vital work and dangerous investigations in wartime England, even when few situations are what they seem to be. Can a marriage broken by harsh words be saved, and will injuries suffered in the line of duty heal? These courageous women do battle on multiple fronts whilst maintaining dignity and friendship.