Capt. W.E. Johns 
Biggles and the Lost Sovereigns [EPUB ebook] 

With a necklace of twenty golden sovereigns round his neck, a dead native is found drifting in a canoe among the islands off the Malay Peninsula. Had the money any link with the cargo of twenty thousand like them on board the schooner Vagabond when it pulled out of Singapore more than twenty years before—and vanished!