Grave Mistake
Encyclopedia
Grave Mistake is a detective novel by Ngaio Marsh
Ngaio Marsh
Dame Ngaio Marsh DBE , born Edith Ngaio Marsh, was a New Zealand crime writer and theatre director. There is some uncertainty over her birth date as her father neglected to register her birth until 1900...

; it is the thirtieth novel to feature Roderick Alleyn
Roderick Alleyn
Roderick Alleyn is a fictional character who first appeared in 1934. He is the policeman hero of the 32 detective novels of Ngaio Marsh. Marsh and her gentleman detective belong firmly in the Golden Age of Detective Fiction, although the last Alleyn novel, Light Thickens, was published as late as...

, and was first published in 1978. The plot concerns the murder of an elderly widow in a nursing home, and involves a rare, and famous, postage stamp
Postage stamp
A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

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