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.
In Boyle, Ireland in 1989, Martin Moone has made a somewhat unusual friend.
Martin befriends new boy Trevor in order to dine on his family's regular gourmet meals while Debra is too distracted with political campaigning to feed her youngest child. Ma Moone and her friends hope to incite girl power in the local area by canvassing for politician Mary Robinson, but they're less than thrilled when they're forced to turn to fishy rich man Francie Feeley for funding.
Using the battle for the bathroom as an opportunity to catch extra zeds, Martin falls foul of Sinead's pranks when she covers him in make-up while he's asleep. Unable to get to a mirror, Martin heads off to school unaware of his Boy George-esque look...
Uncle Danny arrives just in time for Martin's birds-and-the-bees talk with Mum and Dad. Sean seeks solace with other imaginary friends when Martin upsets him.
Fidelma joins the church choir while Martin's confirmation service leads to an epiphany.
It's Martin's final week at primary school and he wants to leave a mark. Fidelma manages to drop a bombshell.