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Hi, I know there's an entire group devoted to book sleuthing, but I thought I would ask here first:
I think at least a decade ago I read a book about Holmes/Watson/Mrs. Watson.

I'll relate what I know -- but my memory could be wrong or I could be (unintentionally) combining books...

It wasn't really a "Kids" book per se, but (as I recall) it was illustrated, oversize, hardcover type kids book
But it was the type where you interact with it --
By this I mean: if someone got a letter or telegram, it would in a real envelope built into the page, and then you would have to pull the letter out and read it

As I recall, Watson & Holmes are off to solve a mystery and Mrs. Watson (of course) got left at home
As I recall, the "twist" at the end is that Mrs. Watson is in league with Moriarty the entire time...
I'm not sure that Watson or Holmes ever figured it out

Thanks for any suggestions.

I think this may be the book you are thinking of edited by Duane Swierczynski. There is a different covered pictured if you click on the link.

Thank you April; I am sure you are right; hopefully I can get a copy via the Library to make absolutely certain.