The Earl of Bridgerton - by Julia Quinn

Penélope Featherington has been coming to the Bridgertons' house for many years. And for many years she has had a secret passion for Colin, her best friend's brother and one of the most charming and aloof bachelors in London.

When he returns from one of his long trips abroad, Penelope discovers his biggest secret by chance and comes to the conclusion that everything she thought about the object of her desire may not be true.

He, in turn, also has a surprise: Penelope has transformed from a dull young woman ignored by all of high society, into a woman with a sharp sense of humor and unusual beauty.

When faced with such a change, Colin, who had always seen her as just an occasional fun companion, begins to want to spend more and more time by her side. When the two share their first kiss, he doesn't understand how he could never see what was always right in front of him.

However, when he learns that she is keeping a secret even bigger than his own, he must decide whether Penelope is his biggest threat or the promise of a happy ending.

In The Secrets of Colin Bridgerton, the fourth book in the Bridgertons series, which has sold more than 3.5 million copies, Julia Quinn builds a beautiful story that proves that the deepest love can be born from a long friendship.