Mighty Jack by Ben Hatke

Jack must watch his younger sister, Maddy, for the summer.  Maddy is autistic and does not talk.  So when she tells Jack to buy a case of odd looking seeds, Jack listens to her because she actually talked.  Together they maintain the garden but evil lurks and threatens the wonderful summer.
Mr. Hatke has taken the original Jack and the Beanstalk and transformed it into a modern story.
The book ends on a cliff hanger but the sequel will not be published until September 5, 2017.
My fourth grader read this book three times, straight through, in three days!  It is very exciting and full of adventure.
Warning: Jack has a bit of an attitude at times but really has a good heart.  The mom says the word "crap".