Jon and Mack's Terrifying Tree Troubles

It's like a bad game of Telephone.
Grant locates a murdered teen in McMinnville. He calls Jon.
Jon locates the girl's ghost. He calls Mack.
Mack talks to the ghost who leads them to more ghosts. Who lead them to even more ghosts.
And why are all the murder victims buried under trees?
The boys are ready for this game to end, please. (Donovan especially.)
Tags:
Jon's World crossover, hail hail the gang's all here, oh look we meet Grant, trees are not to be trusted, according to Donovan, ya'll pray for Donovan, there's so many ghosts, the ghosts have some WORDS to share, car sex, bondage sex, Mack has plans, so of course they get ruined, BAMF female cops, Jon and Mack are ready for this case to be over, please and thank you, serial killer(s)? running amok, people get tombed, literally, Eli's mad she missed the fun, Mack would like to say: Don't use Jon as a battery, seriously don't do it