There are 3 books in the Midnighters series. The newest book is Blue Noon which came out in 2008.

1
The Secret Hour

Book cover of The Secret Hour
A few nights after Jessica Day arrives in Bixby, Oklahoma, she wakes up at midnight to find the entire world frozen, except for her and a few others who call themselves 'midnighters'. Dark things haunt this midnight hour - dark things with a mysterious interest in Jessica. The question is…
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2
Touching Darkness

Book cover of Touching Darkness

This is the second book in New York Times bestselling author Scott Westerfeld’s Midnighters series.

As the Midnighters search for the truth about the secret hour, they uncover terrifying mysteries woven into the very fabric of Bixby’s history, and a conspiracy that touches the world of daylight.

This time Jessica…

3
Blue Noon

Book cover of Blue Noon

the darklings will hunt once again

The secret hour when time freezes arrives every night at midnight in Bixby, Oklahoma. It's a dangerous time, when five teenagers are the only humans awake and dark creatures crawl out of the shadows, but at least the midnight hour is regular and predictable.…