Magyk, by Angie Sage

Silas Heap is a seventh son, and husband to Sarah Heap, they are about the have their seventh son. But tragically, their son Septimus dies shortly after being born. While out walking the forests that same night, Silas discovers a baby girl abandoned in the snow. This is a story full of magyk and mystery, discovered identities, ghosts and wizards.

I highly recommend this book. Though intended for immediate readers (ages 12+), it is a wonderful book for all ages.