World After  - Susan Ee

I'm very, very attached to the heroine, Penryn, in the Angelafall series. She is completely kick ass. She sacrifices herself to save others and does it without whining. 

With the Angel Apocalypse coming to a head, Penryn manages to play it cool saving imprisoned humans and finding her sister Paige after an unfortunate incident with the Resistance. 

This series is nonstop action that keeps my stomach in knots until the final word on the last page. I really look forward to the next installment!!!