okey-dokey, so yes, the picture says Verdigris Deep. It's the same book, just different titles. Verdigris Deep in UK (already released) Well Witched in USA (not released, explaining why I can't find a picture of its cover). Or, maybe it's just really late.... ;)
ANYWAYS, here's the small book review.
Well Witched by Frances Hardinge
Well Witched is a suspenseful and very unique story of three kids whose lives are changed because of a few coins in a wishing well. I would definitely recommend this book, but under the severe warning that you will never look at a shopping cart the same way you did before reading this book ever again…