Indiscreet Horsemen Trilogy, Book 1.

From New York Times bestselling author Mary Balogh comes the first novel in the Horsemen trilogy, a scandalous romance of yearning passion and dangerous desires... In the country visiting his twin brother, Viscount Rawleigh longs for a little diversion and beautiful young widow Catherine Winters seems like easy prey. But Rex's target is a lady of virtue, and when she roundly rejects his improper proposal to become his mistress, Rex finds...