England, June 1944. With Allied forces gaining a foothold after the Normandy landings, Hitler unleashes his most vicious weapon of war yet--the V-1 flying bomb. One of these new weapons lands on a Camberwell convent, killing three nuns. Suzie Mountford and her boss and secret lover Tommy Livermore are sent to investigate. When it's discovered that one of the dead nuns is not what she seems, they find themselves in the middle of a complex, sinister plot.