Meet our hero… Gareth St. Clair is in a difficult position. His father, who despises him, is determined to squander the St. Clair fortune and leave him with nothing. Gareth's only inheritance is an old family diary, which may contain the secrets of his past… and the key to his future. The problem is that the diary is written in Italian, and Gareth doesn't know a single Italian word. Meet our heroine… All of high society agrees: there's no one like Hyacinth Bridgerton. She's friendly and smart, devilishly honest, and according to Gareth, tolerable, but only in small doses. Yet something about her—something charming and infuriating at the same time—captivates him… Meet the unfortunate Mozart… Or rather, you can't meet him. But rest assured, he turns in his grave every time Gareth and Hyacinth meet at the annual—and generously off-key—Smythe-Smith musical evening. For Hyacinth, every word from Gareth seems like a challenge, so she offers to translate his diary, even though her Italian isn't exactly perfect. But as they study the mysterious text, they discover that the answers they seek are not in the diary but between them… and that there's nothing simpler—or perhaps more complex—than one single, perfect kiss.