Half-Off Ragnarok (InCryptid) by Seanan McGuire
I admit, I was disappointed when I first heard that this would follow Alex rather than his sister Verity, who was the heroine of the previous two books in the series. But the minute I opened my new paperback, I realized how very wrong I was.
From the opening scene, I found myself totally enchanted with crypid herpetology and of course Alex. As an amateur field-naturalist who used to be one of those teenaged volunteers wandering around the bog for the annual turtle count, I could identify with Alex right from the get-go. On top of that, as one might expect for the InCryptid series, it's still a fast paced story of magic, family, love and biological science. And, oh, it's also a murder mystery where people are being turned to stone.
To avoid any further spoilers, I'll just say that I loved it. Highly recommended if you enjoy urban fantasy... or field biology!