1815: Napoleon's escape from Elba and the preparations for battle entangle the Morland family in a web of romance and heartbreak.

The Allied Army is gathering in Flanders, and where the army is, the fashionable world must go- so London society hastens to Brussels to enjoy the most exhilarating Season ever.

For Heloise it brings a renewed acquaintance with her former suitor, to Duc de Veslne-d'Estienne; while Rosamund must finally come to terms with her feelings for her cousin Marcus; and for Sophie, a meeting with an enigmatic French major could well alter her future.

But as romance flourishes in a warlike atmosphere, the looming shadow of battle only makes the dancers whirl more feverishly.

And when the Army marches out to face the might of the French at Waterloo, one question is in every heart: which of them will not come back?