"Bucket of Blood" reads the old sign hanging over the doorway of the weather-beaten house where Uncle Will lives. But he will have to move to an old-age home unless Sally, Amy and Jack can find the treasure... money, and an uncut diamond!

The only clue is a counting-out rhyme: "William Mr. Trimbletoe," it goes, "catches fishes, puts them in dishes..." It makes no sense at all.

The sleuthing begins. Each clue brings a new treasure, but as the hunt continues, Sally, Amy and Jack discover that the most important clue is the hardest of all to unravel.