Kids on Bikes: Second Edition Core Rulebook

From the book's introduction:

In a world of unspeakable horrors, working together is the only way forward. In Kids on Bikes, people come together to solve terrifying mysteries and stop the unknown from entering our world. And as players and facilitators, we come together to tell these stories. This chapter is about setting up an out-of-game experience that creates an incredible in-game experience. Here
you’ll find everything you need to know about playing Kids on Bikes before you roll up a character or create the first monster.