Island in the Stars (Problim Children, Bk. 3)

The Problims' baby brother, Toot, is kidnapped by the evil Cheesebreath, who won't let Toot go until the Problims lead him to their grandpa's treasure. Grandpa's clues say it lies "where the stars fall into the sea . . . " and the treasure could be dangerous in villainous hands!

Now Sal and his siblings have only three days to figure out the puzzle, destroy the treasure, and rescue Toot before Cheesebreath gets his hands on their grandpa's secret and uses it to break apart the Problim family . . . forever.