This is the Heyer that I've been trying to find for ages, and every time I end up picking up Charity Girl instead and get frustrated. It's a similar set up of sorts, a young country gentleman in an impulsive mood stumbles across the poor cousin of a local family, and offers her shelter. Except in Friday's Child, the gentleman in question is in a bad mood because his childhood friend just turned down his proposal, so he decides to elope with the young waif he has acquired.