Soon after her twin Leonora's marriage a bereft Marguerite Fortune is going home to Castle Fortune, with only her self serving male relatives for company. But Baron Fortune, her papa, has a diversion planned on the journey ... one that concerns getting his last daughter wed. At an inn, pining for Leonora, Marguerite meets another Leo, this time a man mountain who reluctantly saves her from harm.
But when Marguerite is abandoned at Dysart Manor to make a match with the pleasant Mr Randall Dysart, she is to meet her saviour once more ... this time using a different name.
The duke in disguise (Leo) teams up with Marguerite to investigate a conspiracy for the succession. It forces them into extreme situations, and soon she is enmeshed in kidnap, plots, affairs, and perhaps even murder. An old friend appears dressed as a groom, she meets a princess, a marquis, colludes with servants and risks her life to save another.
Her bright compassionate nature is hard to resist, as is her astounding beauty, but the duke is determined. Even if Marguerite may learn survival, but lose her heart.