Paul Murton continues his island-hopping odyssey, exploring the islands scattered in the Firth of Forth. He discovers these seemingly peaceful islands have a dramatic history of warfare, from medieval English raids on Inchcolm to the first air-raid attack on Britain above Inchgarvie. Paul learns about the strategic importance of Inchkeith's defences during two world wars before heading to the Bass Rock to learn more about the history of prisoners incarcerated on the island, with 160,000 gannets for company