When Zoe and her best friend Jamie find themselves hurtling through time on an adventure she could never have dreamed possible, Zoe quickly learns that perhaps modern-day teenagers don't have it so bad after all.From Ancient Greece to the last voyage of the Hindenburg, from Victorian England to the Wild West, from Viking-era Scandinavia to convict-era Botany Bay and old Egypt, and many, many more recognizable periods in history, Zoe discovers that in times gone by teenagers lived a very different life to the one which she and Jamie enjoy in 2017.But how can the girls find their way back home to their own place in time? The aperture appears to instantly open and move them on whenever the girls are in any kind of danger, but they don't seem to have a choice as to which part of history they will end up in next. Or do they?Can Zoe discover the answer to the riddle given to her by their new friend Baozhai's Chinese grandmother - and will the answer help them find their way home? And will Jamie's attitude help or hinder the girls' chances of safely returning to where they belong?