Imaginary Numbers (Incryptid, 9) [McGuire, Seanan]

The ninth book in the fast-paced InCryptid urban fantasy series returns to the mishaps of the Price family, eccentric cryptozoologists who safeguard the world of magical creatures living in secret among humans.

Sarah Zellaby has always been in an interesting position. Adopted into the Price family at a young age, she's never been able to escape the biological reality of her origins: she's a cuckoo, a telepathic ambush predator closer akin to a parasitic wasp than a human being. Friend, cousin, mathematician; it's never been enough to dispel the fear that one day, nature will win out over nurture, and everything will change.