12 Book Series That Are Equal Parts Sexy and Sci-Fi

The final chapter of Cassandra Clare's six-book series, The Mortal Instruments, was just released this May, so if you haven't picked up this fast-paced fantasy, now is the perfect time. Clary and Jace, the star-crossed lovers and heroes of the series, have gone through trials with demons, vampires, corrupt Shadowhunters, and more. Here's hoping these two crazy kids can finally make it work in the final installment.