1. Darling Jim by Christian Moerk
2. House of Dark Shadows by Robert Liparulo
3. Pale Phoenix by Kathryn Reiss
4. The Maze Runner by James Dashner
All four books were enjoyable. I haven't reviewed The Maze Runner, yet, (coming soon, I promise!!!) but it's definitely edge-of-your-seat suspense and would also qualify for the YA Dystopian Challenge. I highly recommend it if you're looking for titles.
Many thanks to Carl V. of Stainless Steel Droppings for hosting the 4th RIP Challenge. It has always been my personal favorite and this year was just as fun as always!