When the move to a new house coincides with his baby sister's falling ill, Michael's existence suddenly becomes lonely and uncertain. One afternoon, the boy comes across an old shed half-hidden at the end of the garden, and discovers something that will change his life forever: Skellig, a crumpled creature half-angel, half-owl. With the help of his new friend Mina, who helps him look at things in a new light, Michael helps Skellig get back on his feet. Just when his sister's condition deteriorates and their parents are at her side around the clock, Michael realises that it will take a miracle to keep his family together…