Liam and Debra abandon the kids for a romantic break to celebrate their 20th anniversary - but it all threatens to fall apart after a chance encounter with Liam's old flame. Meanwhile, Martin and Padraic are in Dublin, where they soon discover new talents.

Padraic finds himself caught in the middle of his warring parents and decides to escape his troubles, leading his worried mum and dad to raise the alarm following his disappearance. Unaware of the chaos he is causing, the lad embarks on a life of crime with the help of Martin. Meanwhile, Crunchie's friends stage an intervention after he resorts to drowning his sorrows.

Martin finds out that every clip played on a TV video out-take show earns £250 - so he and Padraic get hold of a camera and try to film themselves doing something stupid. Meanwhile, the Moone household is bursting at the seams when Fidelma, Dessie and baby Rose move in, leaving Liam at the end of his tether.

When crop circles are discovered in Boyle, Martin goes UFO-hunting - and ends up telling the local media his donkey has been abducted by aliens. As the town council goes into crisis mode, fearing the gentle image they've created of Boyle will be destroyed, the council and church try to strong-arm Liam into suppressing his son's story. Will he side with Martin or the leaders of Boyle?.

With Dessie, Fidelma and baby Rose back living with the Moones, the choirmaster sets to work on a new business to help him give his family their own home. But does Boyle really need a Catholic book shop? Liam isn't convinced, and starts building an extension in the garden instead, while Martin has his own building project - renovating his new 'penthouse'.

It turns out that imaginary friends run in the family when Grandad's childhood pal George Gershwin, a cool, piano-playing guy, turns up to fulfil his bucket list - so Martin, Sean and Crunchie Haystacks embark on a series of adventures to help him. Also, with summer just around the corner, Martin takes an unusual approach to his exam revision.