Gareth St. Clair is in a nice welly. His father disinherited him and all he has left is an old family diary that may hold secrets from his past and the key to his future. Unfortunately, it is written in Italian, which Gareth does not speak a word of. Hyacinth Bridgerton is a girl Gareth thinks is best to avoid, but she can speak Italian. When the two meet by chance, Gareth makes Hyacinth promise to translate the diary. As they delve into the mysterious text, they discover that they will not find the answers in the diary, but in each other. And that nothing is as simple - or as complicated - as a single, perfect kiss.