Midnighters 2: Touching Darkness by Scott Westerfeld

This book is the second in the series, and I gave it a rating of four out of five. The Darklings seem to be less active since, Jessica fried most of them at the end of the first book. However, the Midnighters make several discoveries, a couple of which may be large problems. They find out that there's a Midnighter seer in Bixby who has been hiding from the Darklings for the past fifty years. They also find out that there are some "normal" humans who have been helping the Darklings by spying on Jessica and leaving the Darklings messages. The biggest problem is that they discover a Midnighter who was changed into a partial Darkling and has been helping them for the past fifty years. The problem gets worse, because the Darklings need to capture Rex and change him to replace this dying Midnighter.

My summary will make more sense if you've read the first. You need to read these books in order. The plot has many twists and turns as the Midnighters realize they have bigger problems brewing. Jessica and Melissa are still trying to learn to master their powers, and Dess has some internal conflicts developing because of the hidden Midnighter. The plot ends with the Blue Moon rising at 9:00 in the morning! Blue Noon is the third book in the series.