Lee Child's Jack Reacher series of 17 books can be read in any order regardless of publication date. The author intentionally provided enough background information in each book so readers can follow the series in whatever order they choose.
Some book enthusiasts recommend reading the books in the order Child published them to get to know the author's style before reading the prequels. Other fans suggest reading them in chronological order, in other words, reading both prequels before any other books in the series. Some people enjoy reading the series precisely because the books can be read in any order without losing any of the story line.