I'm a huge fan of Annie Burrows's Regency romances and I've read all of them. The Marquess Tames His Bride is the second in the Brides for Bachelors series, but it can be read as a standalone. It doesn't end on a cliffhanger, romance-wise, but there is a mystery that threads through each story which I am assuming won't be resolved until the last book.
The Marquess of Rawcliffe and Clare Cottam (a Vicar's daughter) were childhood friends but have grown apart after Rawcliffe proposed and Clare took it as a joke and turned him down. Now each thinks the other is completely uncaring, although they are still attracted to each other. After several years they meet again. I won't spoil the surprise for you, but after an extremely original proposal scene Clare finds herself accidentally engaged to him. Does she really want to go ahead with marriage to the Marquess, or is he not quite the cold-hearted man he seems?
The proposal scene was definitely my favourite part of the story but I also liked the characters, particularly the strong-willed Clare when she is stands up to Rawcliffe during his alpha male moments. Can she break through the shield he has formed around his heart to stop himself from being hurt? The Marquess may feel he is turning his untamed childhood sweetheart into suitable marchioness material, but it does sometimes seem as though it's the other way around - and that's why I really enjoyed this story!