Where should I start with Investigating the Wicked?
Start with Book One. It introduces Kavel, the world of Strohr, and the mystery that runs under the whole series. The books are meant to be read in order.How many books are in the series?
Three novels are published so far, with more on the way. There is also a full color comic that retells the first arc, which works as a gentle visual entry point.Is it on Kindle Unlimited?
Yes. Every book is available to buy on Kindle and to read free with Kindle Unlimited.