蓋馬汀的原則是對事不對人，但偏偏有一個例外，那就是他的爺爺-華特。他對爺爺所知不多，所以他遠赴拉脫維亞尋根。
As a rule, Guy Martin prefers things to people. But there is one man who he is utterly intrigued by… his Grandad, Walter. Very little is known about Walter, so Guy is off to Latvia to find out about his ancestral roots.
