From the Betting Book at Brook's Gentleman's Club:

Wager: £2,000 that Lord Ellis will throw the first punch when he discovers Lord Throne is wooing a certain duke's sister.

All Bets Are Off When the Game is Love

Lady Gabrielle is thrilled when Anthony Keaton, earl of Ellis, asks for her hand in marriage. She's not so pleased when he then leaves the country and four months pass without a word. Clearly, the scoundrel has changed his mind and is too cowardly to tell her. There's nothing to do but go back on the marriage mart...

When Anthony returns to town and finds his ultimate rival has set sights on Gabby, his continual battle of one-upmanship with Sebastian Thorne ceases to be a game. Anthony is determined to win back the woman who holds his heart--but he's not expecting Gabby herself to up the stakes...