Season: 20 | Episode: 3 | Length: 60m

Adventurer Bear Grylls traces his ancestry, starting by exploring his paternal army-serving grandfather Ted Grylls' old trunk, intriguingly full of documents marked `Top Secret". Next, Bear wants finds out more about the life of his beloved grandad Neville. His father - Bear's great grandfather - is revealed to be a loving family man and progressive headmaster who modernised Harrow School. Bear eventually traces the family line back several centuries revealing, to his delight, Scottish ancestry. A trip to north of the border uncovers the story of Bear's 10-X great grandfather, the Duke of Argyll