Following the robbery of a diamond merchant’s shop in Amsterdam, the killers move to London where the boss has an old score to settle with Henry Miller, the owner of a Diamond Emporium in Hatton Garden. The British police are also after Miller, and Suzie Drake is persuaded to befriend him in order to gather incriminating evidence for them. She has to agree to Miller’s sexual demands to gain his confidence, but finds herself in trouble when the killers take over his shop. They force him to purchase a large quantity of diamonds for them to steal, and it takes Suzie and her partner Mike Randle all their skills to avoid becoming the killer’s next victims.