Michael y su familia acaban de mudarse a un viejo caserón. Una tarde, mientras sus papás cuidan a su hermanita enferma, Michael se escabulle a la desvencijada cochera. Ahí descubre a Skellig, una criatura extraordinaria que necesita ayuda para sobrevivir. Junto con Mina, su vecina nueva, Michael se propone cuidarlo hasta que sane.

Unhappy about his baby sister's illness and the chaos of moving into a dilapidated old house, Michael retreats to the garage and finds a mysterious stranger who is something like a bird and something like an angel. Young readers will by enchanted by this magical tale of friendship and family: Michael was looking forward to his new house and neighborhood, until his infant sister became very ill. Now his parents are constantly frantic, the scary doctor is always coming around, and Michael feels helpless. When he goes out into the old rickety garage, he comes across a mysterious being living beneath spider webs and eating flies for dinner. This creature calls himself Skellig, and over the weeks Michael and his new friend Mina bring Skellig out in to the light, and their worlds change forever.