Whilst out on a picnic, Tommy and ‘Tuppence’ come across a kitchen knife with fresh blood stains on it. Fearing that a murder might have taken place, they take it to the nearest police station. Whilst there, the owner - a middle-aged single mother of two daughters - comes to claim it. Her explanation that she accidentally cut herself and then threw it away doesn't tie in with where the potential weapon was found. The next day, her two teenage girls find their mother with the washing line around her neck, and the kitchen knife is missing. The Beresfords put their detection skills to work out why a woman was murdered over an item of misplaced cutlery.
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