YA detective novel: searching for a missing author which later revealed as old lady they've already met in the process

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YA detective novel: searching for a missing author which later revealed as old lady they've already met in the process

1ashri
Edited: Aug 7, 9:03 pm

Hi! I'm looking for (what I believe) is a Young adult novel. Might or might not be a choose your own adventure type of book.
It's about teenagers working together to solve the disappearance of a famous author.
At one point they met an old librarian (I think), she has a scarf with two of her initials sewn on it.
The twist is revealed later that the old lady is the person they're searching for, and the initials when flipped is revealed to be the author's initials.

I think it has to exist ~2010 since that was when I read it.
It's been a while so details might be very foggy but I'm 100% sure about the scarf-initials thing.
The cover is an illustration with blue hue I think.

2B415
Yesterday, 9:53 pm

The mysterious matter of I.M. Fine?

3lilithcat
Edited: Yesterday, 10:03 pm

4merrystar
Today, 12:48 am