One of the books of a series called "Royal Brotherhood" In the book Alec is the by-blow son of the Prince of Whales. He needs to find an heiress to pay off his debts. Katherine Merivale needs to get married to have access to her trust.
Alec brings his half-brothers together (They don't seem to know about each other)and proposes an alliance to help all to benefit. Alec turns on his charm to win Kit; he hides some of his back ground and his reasons for their courtship.
This is a good book, gets a bit bogged down with dialogue, would consider it a warm and slightly flowery story.
In This the first Royal Brotherhood book, a new Earl, Alec Black, is just finding out that he is Prinny's son, and that he must now marry or lose his easts because of his step-father's mismanagement.
He just forgets to tell his young Miss she is being married for her fortune, then he goes and falls in love, and well.... he doesn't want her for just her fortune anymore, but now that she knows, how does he get himself back into the black in her accounts??