Celebrating a birthday isn't fun when there's a killer on the loose in this scream-worthy read from the author of ESCAPE ROOM. No parents, no rules. Fender, Linnea, Lucas, and Kate are celebrating Kate’s birthday in a luxury hotel. They’re here to have fun and make forever memories. They all know not to bring up what happened last year, especially on this weekend. All that matters is having the most epic time ever. But the party is over. Someone is leaving messages at their door. Someone who knows exactly what happened a year ago. Someone who wants revenge. Underlined is a line of totally addictive romance, thriller, and horror paperback original titles coming to you fast and furious each month. Enjoy everything you want to read the way you want to read it.