Celebes Sea, May 1920: Battered by a typhoon, the Expedient is shipwrecked on a volcanic island. No radio, no rescue, no escape. Doug and Becca MacKenzie's search for their missing parents must wait; but what part did the mysterious Guild play in their disappearance? And what is their uncle, Captain MacKenzie, really searching for? Will the strange riddle Doug and Becca unearth be the key to the dark secrets of the Guild and a means to escaping the island?