ANGEL TRILOGY 3 : ANGEL FEVER - Usborne

"Willow and Alex are mankind's only hope.
With the world in ruins, the angels are enslaving humanity, moving survivors into camps where they devour their energy, causing slow but certain death. Training a new team of Angel Killers, Alex and Willow's love grows stronger than ever - and success is almost within their grasp.
But when Willow senses a terrifying shift in the angels' powers, Alex is forced to embark on a deadly solo mission. Now Willow is left to defeat the angels with Seb, and she has no idea if Alex is ever coming back...
The final captivating book in the bestselling trilogy, Angel Fever is a powerful story of heartbreak, revenge and love."