Mary Brendan 
Unknown Wife 

A rake’s foolishness may cost him his freedom-and his heart-in this Regency romance.A single passionate night’s encounter, long ago, has come back to haunt Colonel Etienne Hauke. He has a son-by a disgraced Society beauty who demands that Etienne should make an honest woman of her!Isabel must marry her charming seducer-for the sake of her child. Although, still resenting her years of shame, she determines it will be a marriage in name only. . . .