Barney Thomson, awkward, diffident, Glasgow barber, lives a life of desperate mediocrity and his uninteresting life is about to go from 0 to 60 in five seconds, as he enters the grotesque and comically absurd world of the serial killer.

Narrowly avoiding jail, new dad Robbie vows to turn over a new leaf. A visit to a whisky distillery inspires him and his mates to seek a way out of their hopeless lives.