The end justifies the means.The many over the few.Time travel has rules as seventeen-year-old Charlie Lamp is about to learn.But what happens when you break one?When Charlie's grandmother is murdered, Charlie is plunged into the world of the Temporal Sinistrum. A secretive organisation of time travellers tasked with maintaining the historical timeline. Her grandmother was once one of their star agents, and Charlie must step into her footsteps and solve the mystery of her death, in an adventure that takes her from Australia in 1966 to the post-apocalyptic wasteland of Los Angeles in 2120.