When Marvin Redpost agrees to go over to Casey Happleton's house, he doesn't know what he's in for. Casey shows him the magic crystal she has just found and offers to give Marvin a few wishes. Is the crystal really magic? Or is it too good to be true?

שם הספר
There's a boy in the girls' bathroom
Sixth grade secrets
Sideways stories from wayside school
Holes
Marvin redpost : a flying birthday cake?