Johnny O'Brien

To thwart their arch-enemy, Pendlesharp, and his misguided notion of changing history, schoolboy Jack Christie and his friend Angus travel back in time to foil a plot to assassinate Elizabeth I, meeting playwright Christopher Marlowe and a young actor named William Shakespeare along the way.

Fifteen-year-old Jack is sent to 1914 Europe as a pawn in the battle between his long-lost father, who has built a time machine, and a secret network of scientists who want to prevent him from trying to use it to change history for the better. Includes historical notes.

Teenage time-traveller Jack Christie is back, this time with a mission to stop World War Two from going nuclear. Jack travels to a crucial turning point in history where the Nazis threaten world domination. Will Jack be able to protect the past and save the world as we know it? Includes historical notes. Suggested level: intermediate, junior secondary.

When Jack Christie's father disappears, the time-travelling teenager and his best friend Angus track him to a strange icebound future where China has evolved into a global superpower. Time has splintered and Jack and Angus must discover the point of divergence - the moment that history altered. Travelling back to 1860, they find themselves in the midst of the bloody Taiping Rebellion: a world of Chinese warlords, Empires and brave rebels. But Jack and Angus possess an object that all the warring factions want and it's not long before the boys find themselves - and the future of the world - in grave danger.