Razor blade
Between her driving licence and her Tesco Clubcard she kept a razor blade. She imagined a thief sliced to the bone, his blood staining the cash like a bank vault's dye packs. She began leaving her handbag open in bars and walking home alone. She left her wallet on the wall outside the supermarket. It came back to her in the post three days later, with a rust-brown circle on the leather.