Feighlí? Tá Niamh agus Aonghus rómhór le feighlí a bheith acu. Nó sin a cheapann siadsan. Ach té tuairimí eile ag an au pair nua ... agus cleasanna nua aici freisin! When eleven-year-old Niamh and nine-year-old Aonghus are left in the care of Marie-Claire they are not pleased. They think they are too old for a babysitter and they have successfully gotten rid of seven of Marie-Claire's predecessors by playing nasty tricks on them.This one looks almost too easy – easy peasy – ÉASCA PÉASCA in fact! However, Marie-Claire is no pushover. There's something 'knowing' about her. Soon the terrible twosome find out that Marie-Claire has special powers, powers that she has no problem using against the children and their tricks......