Dreaming of You by Lisa Kleypas

When shy and secluded author Sara Fielding ventures from her country cottage to research a novel she inadvertently witnesses a crime in progressand manages to save the life of the most dangerous man in London. Derek Craven is a powerful and nearlegendary gambling club owner who was born a bastard and raised in the streets. His reputation is unsavory his scruples nonexistent. But Sara senses that beneath Dereks cynical exterior he is capable of a love more passionate than her deepest fantasies.