He's a duke. He's a mathematical genius. He can't talk and he's locked in a lunatic asylum. Only a modest Quaker girl can reach him, but when she helps him to escape, she's swept into his glittering aristocratic world, her life torn apart by his desperate attempt to save himself.

Cassandra DeWitt has seen her husband only once - on their wedding day two years earlier - and this arrangement suits her perfectly. She has no interest in the rude, badly behaved man she married only to secure her inheritance. She certainly has no interest in his ban on her going to London. Why, he’ll never even know she is there. Until he shows up in London too, and Cassandra finds herself sharing a house with the most infuriating man in England. Joshua DeWitt has his life exactly how he wants it. He has no need of a wife disrupting everything.

A fatally dangerous man...and the woman who stands in the way of all he's ever desired. Beautiful and ruthless, the elegant assassin Allegreto will stop at nothing to regain his rightful place. And the perfect instrument has just fallen into his hands, in the lovely form of Lady Elena - the long-lost princess of the land he intends to wrest back from his enemies. But she is no mere maiden to be possessed.

Will, Viscount Wingrave, whiles away his time gambling and bedding married women, thwarted in his wish to serve his country by his controlling father. News that his errant son has fought a duel with a jealous husband is the last straw for the Earl of Marstone. He decrees that Will must marry. The earl's eye lights upon Connie Charters, unpaid housekeeper and drudge for a poor but socially ambitious father who cares only for the advantage her marriage could bring him. 

When a powerful, decisive aristocrat undertakes to protect an absent-minded young inventress from England's enemies, he finds his orderly world turned into chaos. Merlin Lambourne's stubborn dream of flight puts her at risk, not to mention driving Ransom crazy. In spite of himself, he's oddly enchanted by this muddled miss and her eccentric ways... but can he overcome his own fears and realize her invention may be the answer to saving both their lives?