The Eighth Day by Dianne K. Salerni

This book is a 2014 release, and I gave it a rating of four out of five. Jax is living with an eighteen-year-old guardian, Riley, and he soon discovers the world is much different than he thought. Most people live with seven days in the week, but some people only live during an eighth day. The eighth day was created by Merlin to control the evil magic that arose hundreds of years ago. Riley is a descendant of King Arthur, and Jax and he are able to exist during all eight days of the week. Riley doesn't tell Jax everything he needs to know, so Jax makes some huge mistakes. He doesn't fully understand the importance of the girl living next door and how the survival of all "normals" depends on her. There are men who want to use her powers to free the evil magic trapped in the eighth day. Jax finally discovers this plot, but it may be too late.

The idea of an eighth day is similar to the ideas shared in The Midnighters trilogy by Scott Westerfield, without the strange creatures. The plot took a little while to get going as Jax was left to learn about the eighth day on his own. However, once the action got going, it really got going. Everyone who lived during the eighth day had a special power; Jax could make people answer his questions. I found it strange that most people in the eighth day were able to resist his power. Riley and the girl next door were more powerful, and their abilities were more useful.