What are some popular secret mystery novels?

Gillian Flynn's 'Gone Girl'. It offers a modern take on the mystery genre. The story twists and turns as it follows the disappearance of a woman and the subsequent investigation which reveals many secrets about the relationship between the main characters.

One popular 2018 mystery novel is 'The Woman in the Window' by A.J. Finn. It's a psychological thriller that keeps readers on the edge of their seats with its unreliable narrator and a mysterious neighbor.

Agatha Christie's 'Murder on the Orient Express' is a classic. It has a complex plot with a murder on a train and a detective, Hercule Poirot, who has to figure out who the killer is among a group of suspects. There are many twists and turns in the story which make it really engaging.

One popular secret history novel is 'The Da Vinci Code' by Dan Brown. It delves into hidden secrets within the Catholic Church and art history. Another is 'Umberto Eco's 'Foucault's Pendulum', which weaves a complex tale of secret societies and esoteric knowledge. And 'The Name of the Rose' by Eco as well, with its exploration of a medieval monastery's secrets.

One popular 'dirty secret novel' could be 'Fifty Shades of Grey'. It's known for its exploration of a rather complex and somewhat taboo relationship. Another might be 'Lolita', which delves into a very controversial relationship. However, these novels often stir up a great deal of debate due to their themes.

One popular secret society novel is 'The Da Vinci Code' by Dan Brown. It involves a secret society called the Priory of Sion and a lot of mystery and intrigue around religious secrets. Another is 'Angels & Demons', also by Dan Brown, which delves into the Illuminati, a secret society in the context of Vatican mysteries. 'Foucault's Pendulum' by Umberto Eco is also well - known. It's a complex novel that plays with secret society ideas, conspiracy theories, and historical references.

One popular secret service novel is 'The Bourne Identity'. It follows Jason Bourne, a man with amnesia who discovers he has skills related to the secret service. Another is 'Tinker Tailor Soldier Spy', which is full of espionage and secret service intrigue in a Cold War setting. Also, 'Alias Grace' has elements of mystery and the secret service as it delves into a historical crime mystery.

One popular'secret child novel' could be 'The Forgotten Daughter'. In this type of novels, there is often a plot where a child's existence has been hidden or kept secret for some reason, like family secrets or misunderstandings. Another one might be 'The Hidden Heir' which usually involves a story of a child who is the heir to something but their identity has been concealed.

There's also 'Hidden Pregnancy, Hidden Love'. This story focuses on a relationship where one partner discovers they are pregnant but chooses to keep it a secret from the other. As the story progresses, it shows how the secret impacts their relationship and the choices they make.

One popular secret romance novel is 'The Notebook' by Nicholas Sparks. It tells a beautiful and secretive love story between two people that spans many years. Another is 'Pride and Prejudice' which has elements of secret admiration and slow - burning romance. And 'Romeo and Juliet' also involves a secret relationship that has a tragic yet passionate aspect.