Martin Moone is a young boy who relies on the help of his imaginary friend Sean to deal with the quandaries of life in a wacky small-town Irish family in the 1980's.
Martin is appalled when his dad takes the family on holiday during the 1990 World Cup, so he tries to hitch-hike back to Boyle to watch a vital match on home turf.
It's the dawn of a new era for Martin Moone as he begins secondary school, and while he isn't impressed with his friends' talk about girls, he soon changes his tune when he meets art teacher Miss Tivnan (Amy Huberman), a vision at the blackboard who sparks a romantic rivalry between him and Sean. Meanwhile, Dessie has an important question for Fidelma.
Back in the summer, Martin and Padraic started building a raft. They planned to sail down the river into town, buy ice cream and frolic in the water. But now it's October and the raft still isn't quite finished. So instead, they'll make it a Halloween ghost ship.
Like all young lads in the early 90s, Martin wants needs a Sega Mega Drive. Be gone slinky, hello magic machine. But Liam is having none of it: not only is this whole computer thing just a fad, work is slow and money is tight.
Could love be in the air when Martin's new classmate and neighbour Majella catches his eye? Father Linehan plans a memorable stag do for Dessie.