But this was a resolution more easily made than kept. For a short space Steve did succeed in detaching his thoughts from the annoying puzzle. Lying there on the sand with Cavvy’s head pillowed on his stomach, he grinned in silent appreciation of Micky’s airy monologue, and presently began to hum under his breath the air Champ Ferris was laboriously coaxing from a much harassed guitar. Then, unconsciously, his glance swept past the lounging figures of his friends and out across the wide stretches of shadowy water vaguely luminous under the stars. Back of those shadows Loon Island lay, with all the other rocky little islets that crowded the entrance to Shelbourne harbor. And, perhaps, on Loon Island—