Adopted daughter and principal collaborator of James Fitzroy, roving ambassador, special correspondent for the American Secretary of State in Europe, Susan is a clever, multilingual young woman, in full bloom and perfectly happy in the eyes of an attentive father.

But this too-perfect happiness hides many faults, sorrows and mysteries. Trapped by her past, Susan will have to play her most dangerous role in a life already rich with adventure: Lady S, high-class spy in a diplomatic environment.