And my go-to for mysteries/thrillers is Stop You're Killing Me, which also lists 12 titles in this series. I'm traveling on business and don't have time to look, but my favorite theories when Kindle/Kobo and other websites get it differently are:
1) Sometimes when a publisher has only some titles in a series, they just start with #1 as the first title they have rights to, regardless of whether there are others. And same on the other end - maybe this publisher only has the first six, and the others aren't out in e-book, or are out from a different publisher.
2) Some folks count collections of short stories/novellas/etc. as books and some don't.
3) Sometimes there is disagreement about whether a title is actually in a series, especially when there are shared characters between series.
JMTCW...off to work...
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