The Elder (Guardian Series #4)

Clare has been possessed by the most powerful angel to walk the earth and fall from heaven. Her body is his to kill, maim, and destroy, and they do plenty of all three. Together, they will set the world on fire.

The Elder is the fourth and final book of The Guardian Series. The series is continued from The Watcher Series, and focuses on the ridiculous, terrifying, and dramatic story of Clare, Daniel, Alex, Reaper and the Saints' fight to bring peace to the world.