The Folk Keeper (Franny Billingsley)

Summary: She doesn't really know who she is or what she wants...

Corinna is a folk keeper.  Her job is to keep the mysterious Folk who live beneath the ground at bay.  But Corinna has a secret that even she doesn't fully comprehend, until she agrees to serve as Folk Keeper at Marblehaugh Park, a wealthy family's seaside manor.  There her hidden powers burst into full force, and Corinna's life changes forever... (from amazon.com)

Where can I find it?: Boston Public Library: West Roxbury branch, or as an ebook at https://bpl.bibliocommons.com/v2/record/S980C14317

Tags: Orphans; Selkies; Fairies; Teenage girls