FALSE COLOURS by Georgette Heyer

I’m starting to wonder if I’ve read all the good ones of these, because the last few have been pretty rope-y. In this one, a twin substitutes himself for his brother and ends up falling in love with his fiance. It feels like it’s going to be classic Heyer, everyone has grey eyes, the hero wears tight white breeches and etc. But it kind of gets derailed into strange ‘mystery’ plot twists. However it put me to sleep in many an overly air-conditioned motel room, which is what I asked of it.