I'm currently reading Spellbent by Lucy A. Snyder, a fantasy novel
featuring a ferret as one of its main characters. Here's a synopsis
from Amazon.com.

Randie

"When an innocent spell somehow opens a portal to Hell, young mage
Jessie Shimmer manages to kill the demon about to stomp on downtown
Columbus, Ohio, but she loses an eye, a hand, and her lover and mentor,
Cooper. Benedict Jordan, ruling mage for the area, forbids any attempts
to find Cooper, who may still be alive in Hell, and strips Jessie of
her resources. With little more than her ferret familiar, her magic,
and the help of Cooper's smart-ass half-brother, Jessie must rescue
Cooper and uncover Benedict's motives. Threads of romance, horror,
action, and humor weave throughout, serving as the perfect backdrop
against which memorable characters and a unique system of magic can
shine."

[Posted in FML 7250]