Anthony Horowitz 
Power of Five: Nightrise [PDF ebook] 

The battle with the Old Ones continues in the third exciting volume of the bestselling Power of Five series, from the creator of Alex Rider.Nevada, USA. Fourteen-year-old twins Jamie and Scott Tyler are performing a mind-reading act in a dingy theatre. But when a sinister multinational corporation, Nightrise, kidnaps Scott, Jamie is left alone – and wanted for murder. He becomes embroiled in a corrupt presidential campaign and breaks into the American prison system before being propelled ten thousand years into the past, where he encounters the other Gatekeepers and witnesses the creation of Raven’s Gate – and the first fateful battle against the Old Ones.