The Clockwork Crow (The Clockwork Crow #1) by Catherine Fisher
Orphan Seren Rhys is on her way to a new life at the remote country mansion of Plas-y Fran when she is given a package by a stranger late at night in an empty train station. The package contains a crotchety, mechanical talking crow, which Seren reluctantly brings to her new home. But when she gets there, the happy Christmas she had hoped for turns out to be an illusion--the young son of the house, Tomos, has been missing for almost a year, rumored to have been taken by the fairies. With the Crow's reluctant help and a little winter magic, Seren sets off on a perilous journey to bring Tomos home.
Dog Gone note: This book is in excellent condition.