I Saved a Mermaid and Struck It Rich

Left to die at sea by his uncle, a fisherman saves a mermaid and earns a pearl with ocean powers. He commands fish and whales, reclaims his father's boat, and nets a fortune in rare catches and ambergris. After clashing with an heiress at a cruise auction, he takes a tycoon's deadly reef wager as the mermaid watches. A sea king rises.