Touching Darkness: Number 2 in series (Midnighters)

Touching Darkness  - Scott Westerfeld The Midnighters are forging themselves into a tighter unit and now they find that there are other adults that know something about the Secret Hour. The Darklings have a plan and some human help, the teenagers have to keep themselves alive and fight the evil. Interesting but a book that really needs you to have read the prequel relatively recently.