Renegade Timeline Officer

Harper Wells finally gets a room of her own, away from her annoying big brother. But on the first night in her brand-new bed, she wakes up in the past and meets a young girl named Edie. Has what Harper said to her changed the course of Australia's history?
And who does her strange time-travelling bed really belong to? Harper is thrown into a world of time-travelling spies and puts her life in danger as she tries to find a missing girl before time runs out.