Dagmar Marie Sophie is a poverty-stricken Danish princess whose annoying royal cousin is about to have her stuffed away in a convent. When she finds a wounded man unconscious in her garden, she sees a way out of her desperate situation. Leopold Ernst George Mortimer, seventh earl of March, and spy in the service of the king, finds himself on the wrong end of a saber and left for dead. He wakes up not remembering what happened...in the care of a beautiful woman who says she is his wife. Back in London, Leo-with the help of his old friends the eccentric Britton family-sets out to unravel what he's forgotten... Is Dagmar truly the wonderful, irrepressible woman who makes his heart sing, or is she a dangerous enigma bent on his destruction?