A contemporary YA murder mystery set in sun-drenched LA, for fans of Malibu Rising, We Were Liars and A Good Girl’s Guide to Murder.

"Lauren James’s books are addictive." Alice Oseman

The novel of Lauren James's hugely popular online story "An Unauthorized Fan Treatise"

When Delilah meets Sawyer Saffitz (son of Anya Saffitz, aka Hollywood royalty), she becomes hooked on a decade-old scandal. In her quest for the truth, Delilah uncovers blogposts written by the mysterious “gottiewrites” and is soon caught up in a world of greed, fandom conspiracy theories … and murder. And the deeper Delilah digs, the more dangerous it becomes – because someone is willing to kill to hide the truth.

"Unputdownable stories, morally grey characters you can’t help but love, and twists you’ll never see coming: Lauren James’s books are addictive nosedives into everything from space exploration to parasocial obsession." - Alice Oseman

"Insanely addictive." - Laura Steven

"Last Seen Online is the perfect read for anyone who has ever fallen deep down an internet rabbit hole. A wild trip into the world of fandom, social media and true crime, you will NOT be able to put this book down. Lauren James has cemented her place as one of the most innovative writers in YA right now – I will read anything she writes." - Laura Wood

"LAST SEEN ONLINE will have you hooked right from the off! A gripping and brilliant thriller packed with heart, comedy and mystery, it’s unputdownable. Lauren does a spectacular job of capturing internet culture and fandom, and the result is a fabulous, fast-paced story you’ll be thinking about for weeks!" - Beth Reekles, author of The Kissing Booth series

"This book is a wild ride and I loved every minute of it." - Sara Barnard