The Adventures of Sally by P.G. Wodehouse

This book features a young heiress whose good sense carries her through despite some bad luck (including an unfaithful fiancé, a brother who squanders her investment in his theatrical company, and an unpleasant, but successful man who shocks her with a proposal). The plot developments were not surprising: I always knew who was going to show up next, or what would happen with a given play, but despite the lack of true surprises, it was an enjoyable story.