Professor Horatio Pendulum has done it again. The Chronosphere has overloaded and torn London's history loose across Smithfield and the Barbican. A Victorian flower seller is loitering under Holborn Viaduct, a watchman is guarding St Bartholomew's churchyard against body snatchers, and a Roman centurion has marched to the Barbican expecting a fortress.

Become a Time Hunter and help Dan and Bex solve ten riddles, from Holborn Viaduct to St Giles Cripplegate, meeting the Golden Boy of Pye Corner, the traders and drovers of Smithfield Market, the plague pits of Charterhouse Square and Oliver Cromwell on his wedding day along the way.

This free family audio walk from Fun Kids pairs with a printable Time Hunter map and handbook for a real 2 to 2.5 hour adventure around the City of London. Download yours at funkidslive.com and start hunting.