Dead Men Don't Walk — Max Dann

Dusting thinks he is psychic and knows where to find buried gold. When a late-night dig at a creepy neighbour's place doesn't reveal any, he goes into partnership with Thesaurus and Millicent, and uses a school camping trip to start the business of gold hunting in earnest.

But nothing is straightforward with this bunch, and when they accidentally come into possession of a paper bag full of money, things take a sinister turn, in a hilarious sort of way.