Love Spell by Karen Williams

When Kate Gallagher meets the alluring Allegra one enchanting Halloween evening, it seems her days of reluctant solitude may be numbered. Well, they might be if she knew who Allegra was. Or where she lived. Or what she did when she wasn't with Kate. Or where she pops in from, so unexpectedly. As a veterinarian, Kate knows when you look for answers you ought to find them. But the more questions she asks about Allegra, the more the mystery surrounding her deepens, and the more the woods beyond her home calls to Kate in ways she's never felt before. A masterful blend of fantasy and reality, LOVE SPELL is an imaginative, magical story of determined love in a winter landscape.