The Grimsby Gouger is out for blood. 16-year-old Macy Shepard was trapped, scared and about to die, the only person who could save her life was Detective Peel and he really had a bad headache and not just because of his alcohol problem. There is a murderer loose in the town of Great Grimsby and three girls are missing. 40 years ago the same happened, and Peel's father failed to catch his man. Are the new murders connected? Has the Grimsby Gouger returned or is there a copycat on the prowl?. The clock is ticking and three young lives are depending on Peel and his team to save them. Shocked and shaken by family secrets of his own that come to light, Peel is on the trail of not one but two vicious killers. Follow the rough and ready detective as he ploughs headlong through his own troubled past, searching for answers to secrets long hidden from him.

Dipper Pines and Mabel Pines have spent their summer at Gravity Falls exploring all of its oddities and freaks, but what they don't know is that their biggest mystery and adventure will start when Dipper notices a page ripped out of the notebook.