“A Helios Membrane,” Snouts breathed on a note of understanding. Philomena’s mouth fell open. “That is impossible,” she said when she had her breath back. “I have read about it. The Helios Membrane powers airships, not—not flying breadboards.” “The Membrane is down in Cornwall,” Lewis said, thinking rapidly. “But there may be parts and pieces left over from its construction here. Once it has been exposed to the sun—” “Provided it comes out sometime this week,” Margaret Anne put in. “It can be run along the underside of the board and connected to the engine and propellers. Can it not?” Philomena’s mind was clearly taking up the chase as she appealed to the mechanic. “It can,” she said with a nod. “Come, you lot,” Snouts ordered. “All hands on deck to find pieces left over from the Mem

