It's been over six months since amateur sleuth Gus Green solved his first real-life case, and started investigating his past. When he receives an anonymous message telling him that his missing birth mother Jane can be found at the mysterious 'Circle', an off-grid community based around an ancient stone circle, he knows he has to find out more.At The Circle, Gus and his friends Shell and Kane's investigation seems over before it starts: none of the strange people living there know Jane - or so they say. But when a brutal storm traps the friends at the community, and a dead body is discovered, they quickly realise that there's a new case to solve. A murderer walks among them, and everyone has a motive.The trio find themselves in a race against time to unmask the killer before they become targets themselves. But why were they lured here? What is the power of the stone circle? And how on earth does all of this connect to Jane?