When we last saw Hamish X, he had been captured once more by the evil Grey Agents of the ODA(Orphan Disposal Agency), and the Wind City Orphanage had been destroyed. But with Mimi's strength and Parveen's ingenuity, Hamish X and all their Wind City friends are rescued. Now, new and surprising adventures are in store for everyone, when they make their escape to ... Switzerland! Deep within the Alps, the world's lost children have found safe haven in a hidden world. It is here, in the Hollow Mountain, where the mysteries of Hamish X, his boots, and his past will begin to unfold--if the Grey Agents don't get to him first!