Lou, aged 12, goes camping with her friends Jack, his brother David and sister Emily on farmland near the historic city of Lichfield in Staffordshire, on the hunt for missing treasure. Bookworm David is convinced that a hoard of Anglo-Saxon gold and silver remains undiscovered near to where the famous Staffordshire Hoard was dug up. The others think that's nonsense, but so what? It's a great excuse to get together again for their second adventure. Emily, still only 10, is scared they'll encounter danger again. The older children reassure her but what they didn't bargain for was feisty farmer's daughter Becky, aged 14, who takes an instant dislike to them. There's sure to be trouble ahead . . .