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.

In this epistolary science fiction novel, two rival agents, Red and Blue, find themselves on opposite sides of a sprawling temporal conflict known as the Time War. As they carry out missions to manipulate the strands of history for their respective factions, their paths cross in unexpected ways. Through a series of secret letters left across time and space, what begins as taunting correspondence evolves into a deep, forbidden connection. The narrative weaves a complex tapestry of time-travel and intrigue, exploring themes of love, identity, and the consequences of actions within the ever-shifting sands of time. As their bond deepens, Red and Blue must ultimately decide where their loyalties lie and what sacrifices they are willing to make for a chance at a future together.

This novel unfolds the tale of Diana Bishop, a young scholar and descendant of witches, who stumbles upon a bewitched manuscript in Oxford's Bodleian Library. Her discovery pulls her back into the world of magic, propelling her into the heart of a dangerous mystery. Alongside Matthew Clairmont, a mysterious vampire and geneticist, Diana is thrust into a forbidden alliance and an enchanted journey through time. As they seek to understand the manuscript's secrets, they must navigate the perilous waters of forbidden love and the age-old enmities among witches, vampires, and daemons, unraveling a history that threatens the fragile peace that has long existed between creatures and humans.