What are some of the best popular romance novels?

Well, 'Attachments' by Rainbow Rowell is a great best friends romance novel. The story is set in an office where the main character has to monitor the work emails of two colleagues who are best friends. As he reads their exchanges, he starts to fall for one of them. 'The Rosie Project' by Graeme Simsion also has a best - friends - to - lovers aspect. The main character, Don, goes on a journey to find a wife but ends up realizing his feelings for his friend Rosie.

'The Hating Game' by Sally Thorne is a very popular online romance novel. It's about two coworkers who seem to hate each other at first but then there are underlying feelings. Another one is 'Red, White & Royal Blue' by Casey McQuiston. It has a great mix of romance, politics, and humor with a unique story of a relationship between the son of the US president and a British prince.

Some old best friend romance novels worth mentioning are 'Jane Eyre'. Jane and Rochester's relationship has a progression from a rather strange acquaintance to a deep and passionate love. 'The Scarlet Letter' also has elements where Hester and Dimmesdale have a connection that could be related to an old acquaintance turned complex relationship. 'Great Expectations' features Pip and Estella, whose relationship has a long - standing and evolving nature that can be compared to an old best friend - like romance.

One popular 'best friends to lovers' romance novel is 'The Hating Game' by Sally Thorne. It tells the story of two coworkers who start as rivals but are actually best friends in a way, and then their relationship turns into love. Another is 'Friend Zone' by Abby Jimenez, which beautifully portrays the journey from friendship to love.

One popular one is 'To All the Boys I've Loved Before'. It tells the story of Lara Jean, who has love letters for boys she once liked, and one accidentally gets sent to her best friend. Their relationship then takes an unexpected romantic turn.

'The Kiss Quotient' by Helen Hoang is quite popular. It's a contemporary romance that features an autistic woman and her journey in love. Another one is 'The Hating Game' by Sally Thorne. It's a fun and flirty office - romance story. 'Red, White & Royal Blue' by Casey McQuiston is also well - liked. It's a story of a relationship between the First Son of the United States and a British prince.

A third option could be 'The Billionaire's Unplanned Bride'. This novel is about an unexpected encounter between a regular girl and a billionaire that leads to a series of events including a fake relationship that turns into real love. It can be found for free on various online reading communities.

One popular one could be 'Forbidden Love with Dad's Friend'. It usually plays on the idea of the forbidden nature of the relationship which adds an element of tension and excitement.

Definitely 'And Then There Were None' by Agatha Christie. It has a great mystery and some underlying romantic tensions. 'Pride and Prejudice' by Jane Austen can also be considered as it has elements of mystery about the characters' true natures and of course, a wonderful romance. 'The Girl on the Train' by Paula Hawkins also has a mystery aspect and a relationship at the center.

The popularity of 'Pride and Prejudice' can't be ignored. It's a classic revenge - ish romance in the sense that Mr. Darcy's pride causes him to act in ways that seem like revenge against Elizabeth's initial judgment of him. 'Kiss an Angel' is also quite popular. The story of the two characters with their own issues and grudges that turn into love has appealed to many readers. And 'Nine Rules to Break When Romancing a Rake' has been very popular. Callie's rule - breaking, which is a form of revenge on society's norms, and her subsequent love story have made it a favorite among romance readers.