'Passing two fiendishly difficult tests is just the beginning . . .
'All Caspan, Roland, Sara, Lachlan and Kilt need to do to become treasure hunters is undertake two final trials riddled with deadly traps and impossible puzzles.
'It's vital that they pass, because the Brotherhood needs them for an urgent mission – one that could save their kingdom. The five friends must ride their Wardens to the north, into the highlands. They must locate the powerful ancient weapon hidden there. And they must bring it back to the King.
'But the burial mound they seek is far from abandoned. It's inside a giant camp crowded with enemy warriors. How can they ever succeed?' (Publication summary)