A full-throttle adventure in America for the Fifteenth Doctor and Ruby Sunday, as played on TV by Ncuti Gatwa and Millie Gibson. In a National Park in North-West America, the Doctor and Ruby are pursued by large, ape-like creatures who seem to literally disappear into the trees. When Ruby falls ill after apparently being stung, the Doctor believes the infection is extra-terrestrial in origin. They meet Dixie and Greg, two Bigfoot hunters determined to track down the mythical Sasquatch. Standing in their way is Ranger Peone, who’s adamant that the forest is too dangerous to explore. Dozens of people have vanished, or reappeared with no memory, in the last month alone. Then the ape creatures kidnap Ruby, and the Doctor is determined to both save her life and solve the mystery of the Sasquatch. Genesis Lynea, who played Harriet Arbinger in the BBC TV series, reads this tense and dramatic original story by Darren Jones.