This is the first book in the series which introduces The Midnighters who are teens who are able to see and experience a secret 25th hour to the day. And Jessica moves into the town and strange things start happening and she learns she is a midnighter but the creatures that haunt the hour are very drawn to attack her. 
 This was a fun book and setup things nicely for the series. I still enjoyed The Uglies by Westerfield more but I look forward to reading mroe of this series as well