User blog comment:Metool Bard/Fanfiction: Missing Linc (Chapter 9)/@comment-32202721-20190111222011

Okay, so Lindsey's note reveals that there are three parties in this mystery: one party who wanted Lincoln gone (for whatever reason), one party who planned to make that happen for the first party, and one party who got to Lincoln before the second party could.

The first party is presumably Lindsay, and we can assume that the second party is about her age, given the childish language ("don't tattle on us"). Which leaves us with the third party...