Seamus's sister Florence has mysteriously disappeared while protesting at Sellafield about the stock-piling of nuclear waste. And someone has been stealing containers of dangerous nuclear waste before they reach the plant. Are he two events connected? Is the evil S.K.U.N.K. gang involved? Aisling thinks so, but her godfather Seamus is too busy planning a pilgrimage to the shrine at Lourdes to listen to her. So Aisling and her friend Peter, with Seamus's cat Mulligan, join the pilgrimage and soon find themselves on once again chasing S.K.U.N.K. across Europe in a hilarious series of adventures.