Joy is a novel by #1 New York Times bestselling author Danielle Steel, published by Delacorte Press (Penguin Random House) in hardcover on August 13, 2024, and in paperback on May 27, 2025. The book runs approximately 320 pages.

The story follows Allegra Dixon, who is abandoned by her party-loving mother at age six and left in the care of her emotionally distant father before being sent to live in her grandparents' joyless home. Her only escape is through books. At boarding school she meets Shep Williams, a dashing West Point cadet, and their friendship deepens into love. After college, Allegra builds a career as a book editor while Shep rises through the military ranks. When Shep receives a posting to Afghanistan, they marry before he deploys. But the repeated separations and the trauma of war begin to transform Shep into a man Allegra no longer recognizes, leaving her feeling utterly alone once more. The novel follows Allegra's determination to survive a series of abandonments and ultimately find the joy and love she deserves.