A twisting psychological thriller of a family caught in a murderous trap of their own making Mr Marble is in serious debt, desperate for money to pay his family's bills, until the combination of a wealthy relative, a bottle of Cyanide and a shovel offer him the perfect solution. Slowly the Marble family becomes poisoned by guilt, and caught in a trap of secrets, fear and blackmail. Then Mrs Marble ensures that retribution comes in the most unexpected of ways...