Mystery book i read in elementary school; a kid or teen who went looking for a lost will with his grandfather of great uncle. one of the thing i remember is that the grandfather of greatuncle smoked a very distinguishable cigar.

[Max]

this book had a kid or teen who went looking for a lost will with his grandfather of great uncle. one of the thing i remember is that the grandfather of greatuncle smoked a very distinguishable cigar.
i do remember a major spoiler but dont know if im aloud to post it

[Lobstergirl, au gratin]

What year did you read it?

Spoilers are fine as long as they are not in your header. Many books can't be solved without their important spoilers.

[Lobstergirl, au gratin]

Max, are you still looking for this or did you find it?

[Angela]

It involves the main character's elderly neighbor rather than his grandfather or great uncle, but what about The Mummy, the Will, and the Crypt by John Bellairs? There is a character who smokes a pipe.

[Rainbowheart]

The Secret of Grandfather's Diary?

Grandfather Webster's Strange Will?