Verdigris Deep/Well Witched

Verdigris Deep is a book written by Frances Hardinge and was first published in 2014. It is known as Well Witched in the US.

Synopsis
Ryan and his friends don't think twice about stealing some money from a wishing well. After all, who's really going to miss a few tarnished coins?

The well witch does.

And she demands payback: Now Ryan, Josh, and Chelle must serve her. . . and the wishes that lie rotting at the bottom of her well. Each takes on powers they didn't ask for and don't want. Ryan grows strange bumps--are they eyes?--between his knuckles; Chelle starts speaking the secrets of strangers, no matter how awful and bloody; and Josh can suddenly--inexplicably--grant even the darkest of wishes, the kind of wishes that should never come true.

Characters

 * Ryan Doyle
 * Chelle Cooper
 * Joshua (Josh) Lattimer-Stone
 * The Well Witch
 * Will Wruthers
 * Donna Leas
 * Mr. Jeremiah Punzell
 * Jacob Karlborough
 * Pipette Macintosh
 * Miss Madeleine Gossamer
 * Carrie