In 'Based on a True Story,' bestselling author Delphine finds herself trapped in the spider's web of friendship with L., an enigmatic woman of charm and intuition. Overwhelmed by success and struggling with writer's block, Delphine is flattered and relieved to have L.'s support. As L. weaves herself into the fabric of Delphine's life, the line between support and manipulation blurs, pulling Delphine into a psychological maelstrom where reality distorts and identity fragments. What seemed like a lifeline becomes a suffocating trap, making Delphine confront the darkest corners of dependency and creative obsession. Delphine de Vigan's novel cleverly intertwines narrative and truth, ensnaring the reader in a chilling dance of illusion.