I guess every couple of books, we focus on another sibling: Verity, Alex and Antimony. We've met them both, through memories or phone calls, but we didn't get much of them. Alex is a geek who's speciality is reptiles. Crypto-reptiles to be specific. (So. Many. Snakes. Yay!) He works at a reptile house in a zoo as a visiting employee, while trying to breed Basilisk in the backroom, dating another visiting employee who deals with the big cats (and is a super-hot Australian), while trying to figure out why Ohio's frog population is down - and what to do about the cryptozoological replacement in the ecosystem. If the trend continues, winged frogs will be exposed as a Real Thing That Exists, and he's afraid that the rest of the cryptozoological world will soon follow.
Which will expose them to the Covenant, and also freak out the rest of the world. What's a geek-boy to do if he ever wants to have another date with that super hot exchange chick he works with?
Well, let's just have him meet his patchwork family - literally in the form of his Revenant grandfather who's patched together from dead bodies. (He was alive once, but Mad Science intervened after his death. Now grandpa works at the morgue - partly for body parts for him and the rest of the Revenants.)
When people start turning to stone, Alex has to discover what kind of 'mythical' creature is behind this, if it's a sapient one or a more animalistic one being used, and how to stop them. (Basilisk, for example, are cryptozoological and have animal tendencies/brains/mental capacities, while Gorgons are sapient - thus can take part in the human world as long as they put a wig on their hair. If Basilisk are involved, Alex has to go after whoever is unleashing them, whereas if it's a Gorgon, he can go directly after the Gorgon.) The fact that his assistant IS a Gorgon and he has Basilisk in the attic - fine, the backroom - complicates things: could he or Dee, or Dee's community be involved?
And how many people-turned-statue does it take to get the Covenant to notice and investigate? Alex better find whoever's doing this before Ohio finds out...
Sorry, I am tapped out of good descriptions right now, so you get... this.