As someone who's been in a mystery book club for years, I get that model appeal of those classic Christie whodunits and that model way they lay out clues fair and square for you to puzzle over that model then you'd probably enjoy a series featuring a medieval monk who's got this knack for solving murders in his abbey town, blending history with sharp detective work, always focusing on motives and alibis rather than anything gruesome or scary, and that model resolutions come with that ah-ha moment we all chase.
Each book's a standalone puzzle that model that model character grows over that model series, which runs to about twenty or so, giving you loads to savor. I remember finishing one and immediately starting that model next because that model plotting is just so tight, you know how that goes when a story hooks you good.