Should this book have been made part of this series

[Carol She's So Novel꧁꧂]

Hi I don't work with or (usually) read series A Lady's Code of Misconduct has been added to the series Rules for the Reckless Book 5.
Amazon has this series as a four book series but the individual book shows as being book 5 in this series.

My friend says No, this is really a stand-alone with a small (very small) connection to her first book 'Duke of Shadows'. I have absolutely no idea why it was tagged as being part of this series, as it takes place 20+ years prior* to the events in the other books.

*Think she means after as in her review she says the book is set in 1860 & the others in this series are Regency.

[Elizabeth]

Looks like Amazon lists it on the series page: https://www.amazon.com/gp/bookseries/...

[Carol She's So Novel꧁꧂]

Elizabeth wrote: "Looks like Amazon lists it on the series page: https://www.amazon.com/gp/bookseries/..."

OK the page on Amazon I found showed 4 books but also said unavailable. If it is a series by GR standards I'll leave it at that.

Thanks Elizabeth