NMLP P-019244 · True-first precedence · minted 2026-07-04
The Sentinel
Lee Child and Andrew Child · Delacorte Press · 2020
US Delacorte Press first American edition, published October 27, 2020; twenty-fifth Reacher novel and the first co-written with Andrew Child. The UK Bantam Press edition was released on the same day, so the two are effectively simultaneous co-first editions rather than the US being the sole true first.
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New Mexico Literacy Project — True-first precedence NMLP P-019244 for "The Sentinel" by Lee Child and Andrew Child (https://newmexicoliteracyproject.org/id/point/p-019244, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).