Twelve-year-old Liam O'Malley can travel through time with his sister Aoife. Along with their friends Phelim, Seamus and their magical horse Ferdia, they met Oliver Cromwell in 1649 and experienced the horrors of World War I from 1914 until 1918.

A mysterious photograph suggests something is not quite right in the world of history.

Follow our group on their third adventure, as they travel back to try to solve a puzzle in time.

To do this, they have to witness the rise and fall of one of the most evil men who ever lived – Adolf Hitler.

Actions and consequences. The stakes could not be higher. Not only must the team solve a mystery, they must fix history.