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"No Friendly Drop" (1931) by Henry Wade. At first it seems that Lord Henry Grayle has taken an overdose of sleeping medicine, but the autopsy reveals a tiny amount of scopolamine along with the draught-harmless in itself, but fatal when mixed...
A poisoner with apparently expert knowledge is at work in the great house at Tassart. But from what motive, and how? Before he can find an answer to these questions, Detective-Inspector John Poole is faced with a second, more horrible murder.
A poisoner with apparently expert knowledge is at work in the great house at Tassart. But from what motive, and how? Before he can find an answer to these questions, Detective-Inspector John Poole is faced with a second, more horrible murder.