An impressive series-starter. The concept was so unique and original, I had to give it a shot. The idea of existing inside of an alternate compressed dimension within an extra 'hour' of the day is certainly a fantastical basis for a plot, but the author handled the descriptions, rules, and physics of said realm well enough for me to feel immersed in the details. Action-oriented, I saw it as having appeal for both males and females interested in the YA and supernatural genre. 
 The inter-relational aspects were strong, as was the pacing--and I appreciated the believable female lead. I have to give the author kudos for inserting aspects of vocabulary and mathematical terms that could be considered educational, while somehow making it seem more fascinating and integral to character survival than for the sake of beating us over the head with fun factoids. 
 This was a good little bit of sci-fi (or is it urban fantasy?), that answered a number of questions while leaving enough hanging to interest me in reading the next one.