Acclaimed actor and Downton Abbey star Hugh Bonneville, and one of the UK's successful comedians John Bishop, make for an unlikely friendship. However, a chance meeting in a Covid vaccine centre has made them mates and now they're about to cement that friendship on a road trip to discover their family history - but what they both don't know is that they have a deeper connection to each other through their ancestors.

In episode 3, Line of Duty stars Neil Morrissey and Adrian Dunbar met on their audition day for Guildhall drama school in London. A meeting that sparked a 42 year long friendship. Now using DNA and genealogy they are on a journey that will take them across the UK and Ireland, reconnecting with lost cousins and unearthing long held family secrets.