Some people have best friends that they can rely on, but you have something more than that. You have your Familiar, a talking animal companion that is a part of your soul, just outside your body. It has it's own personality and feelings, and you two don't always get along, but you always have each others backs.
This books feature is the Familiar, your animal companion. The moves will help it and you get in and out of trouble, while working with the suspect information you may have gathered. The Link move creates a separate Link list for you to work off of, as well as some moves that play with that.
This is a new playbook for Interstitial: Our Hearts Intertwined, as seen used in Interstitial AP on the Orange Groves!
Art by @HodyCawley