More Work for the Undertaker by Margery Allingham

AND THEN THERE WERE THREE
Their parents are dead. Their fortune is lost. And the five Palinode siblings are shunned by their neighbors as hopeless eccentrics. Suddenly, two of them are found dead�"under the most suspicious circumstances. The surviving Palinodes just want to be left alone. But a ruthless mastermind, armed with lethal potions and a poisoned pen, has made an advance order for three more Palinode coffins. The Yard believes that the strange family is killing itself off, but Albert Campion isn't so sure....

MYSTERY AT ITS BRITISH BEST
Equally at home in the underworld and among the upper crust, super-sleuth Albert Campion rarely misses a clue or fails to find a motive. Behind his horn-rimmed glasses and mild-mannered facade is a brilliant mind that can penetrate to the villainous heart of the most heinous crime.

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