Vacant is number four in the science fiction Mindspace Investigations series. The story takes place in the future in Atlanta, Georgia. There are people who have certain mental powers, and Adam is a telepath. Most of those who have developed powers like telepathy belong to the Guide, but Adam was thrown out for drug use.
Marked is an interesting sci-fi mystery. It takes place in the future,(at a guess about 80 years) where some people have acquired mind powers, some telepathy, telekinetic, pre-cognition, and teleportation and most of them have joined the Guide. My main problem with this book is that it is number three in a series, (I don’t like reading books out of order.)