The first book in the series introduces Percy Jackson, a young boy with dyslexia and ADHD, who discovers he's actually a demigod, the son of Poseidon. Percy is sent to Camp Half-Blood, a summer camp for demigods on Long Island, where he learns about his divine ancestry and powers. When Zeus's master lightning bolt is stolen, Percy, along with his friends Annabeth (daughter of Athena) and Grover (a satyr), is tasked with preventing a war among the gods by retrieving the bolt. The trio embarks on a cross-country adventure to confront the thief and restore peace in the divine world.

In this urban fantasy novel, the third installment of a series, the protagonist, a young Shadowhunter, travels to the titular city, a place of great significance to the secretive world of demon hunters, warlocks, vampires, and other supernatural beings. She is on a quest to find a cure for her poisoned mother, but her mission quickly becomes entangled with a larger conflict as she uncovers dark secrets about her family's past and the true nature of the Shadowhunters. As the city becomes a battleground, alliances are tested, and the protagonist must confront a powerful enemy who threatens to destroy everything she holds dear, all while grappling with her evolving feelings for her enigmatic companion.

The book follows the story of a young woman in 18th-century France who, desperate to escape an arranged marriage and yearning for freedom, makes a Faustian bargain with a mysterious god-like figure to live forever without being remembered by anyone she meets. Her immortality becomes a curse as she moves through the centuries, leaving no mark on the world until, 300 years later, she stumbles upon a young man in a bookstore who, to her shock, remembers her name. This encounter unfolds into a tale of love, memory, and the intrinsic value of leaving one's mark on the world.