I think 'Artemis Fowl' by Eoin Colfer is also very popular. The young criminal mastermind Artemis Fowl gets involved in various mysteries and dangerous situations in the world of fairies and magic. It has a great mix of mystery, adventure and unique characters.
In my opinion, 'The Chocolate War' is very interesting. It challenges the idea of conformity in a school setting. The story shows how a young boy rebels against a corrupt system in his school, which is really thought - provoking.
There's also 'A Wrinkle in Time' by Madeleine L'Engle. It's a science - fiction - flavored young adult book that takes readers on an intergalactic adventure with the main character as she tries to save her father and battle against the forces of evil.
Another good one is 'Miss Peregrine's Home for Peculiar Children' by Ransom Riggs. The story combines mystery with a touch of the supernatural as the main character discovers the strange secrets of an old orphanage. There are really interesting characters and a unique plot that keeps you hooked.
The most popular one might be 'The Fault in Our Stars'. It was widely read and even made into a movie. Its themes of love and mortality really struck a chord with young adults.
I think 'Me Before You' by Jojo Moyes was also quite popular. It was a heart - wrenching love story between Louisa, a young woman, and Will, a man who has become paralyzed. Their relationship and the moral and ethical dilemmas they face made it a very talked - about book.
Well, 'The Princess Diaries' was quite popular. It tells the story of an ordinary girl who discovers she's a princess. It's a fun read with a lot of charm.
These novels may also explore the internal struggles of the characters. Since loneliness is a big theme, the characters could be dealing with self - doubt, depression or anxiety that comes with feeling alone. They might question their worth or purpose in life. For instance, a character might be struggling with a loss, like the death of a loved one, and this makes them feel lonely and lost in the world.
'All the Bright Places' by Jennifer Niven was also highly regarded. It tackled serious issues like mental illness in a way that was accessible to young adult readers. The relationship between the two main characters was beautifully written and it made readers really feel for them.
Young adult fiction often features coming - of - age themes, with protagonists in their teens or early twenties facing challenges like self - discovery, first love, and fitting in. The language is usually accessible. Adult fiction, on the other hand, can cover a broader range of complex themes such as marriage, career crises, and mid - life crises. It may also use more sophisticated language and explore darker or more mature topics in greater depth.