NMLP P-022776 · True-first precedence · minted 2026-07-04

Grave Mistake

Ngaio Marsh · Collins (Crime Club) · 1978

The Collins UK and Little, Brown US editions both carry 1978; global precedence is not reliably UK-first for Marsh's late novels, so establish it per title. The Collins Crime Club printing is the UK first.

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New Mexico Literacy Project — True-first precedence NMLP P-022776 for "Grave Mistake" by Ngaio Marsh (https://newmexicoliteracyproject.org/id/point/p-022776, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).