Familiar

Read Familiar Storyline:

Moira is able to see something few others see: the aura that
surrounds people. What she doesn't understand is what it all means. And
then she meets Arianna, who definitely knows what it means.

Arianna recognizes Moira's unique gifts, and she isn't going to let them go to waste, regardless of Moira's consent. Familiar is best read any time after reading Fox Run.