Nana Sheila finds a box of letters detailing her late husband’s decades-long affair. At a crossroads and with no answers Sheila traverses this painful revelation as anyone would… by donning a lime print dress and hopping on a bus to Blackpool. With the help of her grandson Dudley (a mild-mannered closet case), the two explore the beauty of the UK’s campest seaside town and get a glimpse into the secret queer life of Granddad Bill.