Doug McLeod and his wife Abi unite following a tense separation to travel to the Scottish Highlands for Doug's father Gordie's 75th birthday. Gordie has terminal cancer so Doug's brother, millionaire Gavin McLeod has arranged a lavish party for him, inviting all the important people in the neighbourhood. Despite difficulties getting their three children, Lottie, Mickey, and Jess, to leave the house, they hit the road, but find it congested and they are forced to stop overnight.