The Water Castle by Megan Frazer Blakemore

Love, love, love.  This was a really great book.  It reminded me of Tuck Everlasting of course and even reminded me of Holes.  I loved how it went back in time to Orlando, Harry, and Nora and then went back to Ephraim, Mallory, and Will.  There was enough mystery left at the end to make you continue to wonder which was great.  Like what did Mallory's mom know???  There was a curious conversation between Mallory's mom and dad that never got resolved.  Did Harry ever drink the water.  Great book and set in Maine to boot :)  Definitely gets a ribbit :)