Chapter one: "Full moon."

Another Gravity Falls fantastic about Dipper and Wendy still being together after the whole ordeal in Lovers Mansion. A few months later in Winter time during one of their monster hunts, Wendy gets bitten by what looked like a wolf like animal. Now Wendy is acting more animal like, and hides a deep secret from Dipper. Now Dipper must find out what it is, and help Wendy get back to normal.