The Project is a great read, you definitely won't regret picking this one up. Yes, it's technically YA, but it's one of the YA books with amazing crossover adult potential.
C.J. Tudor is a bit macabre and her books just feel different than your average thriller. Her books are a little bit gory, a little bit spooky, the tiniest bit shocking and super readable.
The Four Winds is a richly drawn work of historical fiction that transports the reader to that moment in history. Hannah does this in a way not many authors can master and it's breathtaking.