JessamynBook 88: The Fan Who Knew Too Much. I don't know how this wound up on my list but it may have been the cover which has nothing at all to do with the book. The main protagonist is a very nerdy awkward woman who is a "professional fan" (goes to cons, gets paid to write about them etc) who has a friend-of-sort-of-friends get murdered and she and the sort-of-friends try to figure it all out by staging a sort-of con of their own. Definitely the type of story I was in the mood for.
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