"The Bone Season" by Samantha Shannon... and a slow, tired run.

When I was a child, living at my parents house, I loved to read.  I loved to read more than I loved being told go to sleep.  i learned a blanket/clothes could block light from leaking out under the door, giving away that you were reading, not sleeping.  (I also learned that if you forgot to move them, that your parents knew EXACTLY what you had done - when they clothes made it hard to open the door when they were waking you up!)  I learned fairly that  a flashlight under the covers didn't cause any light to leak out under the door either (And I learned it was very, very hot!)

Needless to say, I liked my books.