I'm looking for a book or book series that I read a long time ago. I don't remember many details, but I do know it's about a blue hour. It's an hour after midnight where time stands still and it is only available for the 'gifted'. Most people don't notice it but the gifted are able to walk around freely while everyone is frozen.
I'm not entirely sure if there are also monsters involved, who can also walk around in that hour.