What's shaped like a sting ray and flies over Chesapeake Bay? This is the eerie riddle which confronts Rick Brant and his friend Don Scott when, seeking shelter from a storm, they anchor the houseboat Spindrift in a lonely cove along the Maryland shore and spot the flying stingaree.
The "thing," they learn, is not the only one of its kind – one is actually suspected of having kidnaped a man!
The residents of the Eastern Shore of Maryland believe the strange objects are flying saucers, but, weary of ridicule, have ceased reporting the sightings.
Rick and Scotty, their scientific curiosity aroused, begin a comprehensive investigation, encouraged by their friend Steve Ames, a young government intelligence agent, whose summer cottage is near the cove.
As the clues mount up, the trail leads to Calvert's Favor, a historic plantation house – and to the very bottom of Chesapeake Bay. How Rick and Scotty, at the risk of their lives, ground the eerie menace forever makes a tale of high-voltage suspense.
The stingaree swam slowly through the warm waters of Chesapeake Bay. Geography meant nothing to the ray, whose sole interest in life was food, but his position – had he known it – was in the channel that runs between Poplar Island and the town of Wittman on the Eastern Shore of Maryland. The ray was also directly in the path of an odd-looking cruising houseboat, the Spindrift, that had just rounded the north point of Poplar Island and entered the channel.
The sting ray's color was an olive brown, so dark in tone that he looked like wet black leather. He was roughly diamond-shaped, like a kite, with rounded sides. He had a long, slim tail that carried vicious barbs along the base of its upper side. It was from the barbs, which served as defensive weapons, that the name sting ray, or stingaree, derived. The ray was harmless to men – unless one chanced to step on him as he lay resting on the bottom ooze. At such rare times, his tail would lash up, inflicting a serious and painful wound.
A tiny crab, hatched only a week before, swam upward toward the gleaming surface, his churning legs making a slight disturbance. The ray sensed the small vibrations and instantly changed course, speeding through the water like a fantastic spaceship of the future. Intent on the crab, the ray ignored the stronger vibrations caused by a pair of outboard motors and a long, flat-bottomed hull. Not until the crab was within reach did the ray sense imminent danger. With a single flashing movement, he snatched the crab and flung himself upward through the shining surface and into the air.
Rick Brant, at the helm of the cruising houseboat, saw the ray break water and he let out a yell. "Scotty! Look!"
Don Scott, asleep at full length on the houseboat's sun deck, which was also its cabin top, awoke in time to see the dark shape reenter the calm water. "Stingaree!" he exclaimed.
Rick had never seen an area more teeming with life than Chesapeake Bay, unless it was the jungles of the South Pacific. Books, guides to eastern land and water birds, regional fish and reptiles, rested on the cabin top before him, along with a pair of binoculars. He had used them all repeatedly, identifying eagles, wild swans, ospreys, wild duck and geese, terrapin, snapping turtles and water snakes, as well as a horde of lesser creatures. Trailing lines over the houseboat stern had captured striped sea bass, called "rockfish" locally, a species of drumfish called "spot" because of a black spot on the gills, pink croakers that the Marylanders called "hardheads," and the blue crabs for which the bay is famous. He had seen clam dredges bringing up bushels of soft-shelled, long-necked clams that the dredgers called "manos," and he had seen the famous Maryland "bugeyes" and "skip-jacks" – sailing craft used for dredging oysters. The boats were not operated during the oyster breeding season from the end of March until September.
Rick's interest in the life of the great bay was to be expected. As son of the director of the world-famous Spindrift Scientific Foundation, located on Spindrift Island off the coast of New Jersey, he had been brought up among scientists. The habit of observation had developed along with his natural – and insatiable – curiosity.
The tall, slim, brown-haired, brown-eyed boy was completely happy. He enjoyed casual living, especially on the water, and life on the Spindrift couldn't have been more casual. He was dressed in a tattered pair of shorts and a wristwatch. Once, in the cool of the evening, he had slipped on a sweat shirt. Otherwise, the shorts had been his sole attire while on board since leaving his home island a few days before.
Scotty, a husky, dark-haired boy clad only in red swimming trunks, came down the ladder from the cabin top and stood beside Rick in the cockpit. "Now that you woke me up to look at a fish, suppose you tell me where we are? Last thing I remember, we were passing under the Bay Bridge off Annapolis."
"That's Bloody Point Lighthouse behind us," Rick said. "Poplar Island is on the starboard and the Eastern Shore to port. That black thing sticking up ahead of us is a light buoy. When we reach it, we should be able to see the range markers into Knapps Narrows."