The first of an enduring series. The Hardy Boys will soon celebrate their 100th anniversary, but they remain the quintessential mystery and detective stories for young readers. This first one, "The Tower Mystery," introduced the action, mystery, and suspense themes. The boys continue to deliver thrills to this day. It all starts with the boys, Frank and Joe, on their motorcycles delivering important papers to a lawyer in Willowville for their father, Fenton Hardy. He's the well-known private investigator in Bayport. A reckless driver almost forces them over the embankment. It is not long before they find that their friend Chet's yellow jalopy has been stolen, possibly by the same red-haired driver! Stolen loot may be the issue. Later a dying criminal confesses that the loot has been stashed "in the tower" and the Hardy Boys make an astonishing discovery.

Frank and Joe Hardy are investigating a mysterious old house high on the cliffs above Barmet Bay when they are frightened off by a mysterious scream. The boys return to the apparently haunted house and make a connection between the place and a smuggling case their father is working on. When their father goes missing, they start-out investigating the secret caves beneath the house and soon confront the gang of smugglers.

The Hardy boys are determined to learn the secret of an old mill and employ a clever ruse to gain entrance. But soon they are trapped. In this adventure, there is danger on two levels for Frank and Joe. First, they confront a nasty gang who will stop at nothing to halt their investigations and second, their father Denton Hardy is on a confidential mission that may deal with sabotage. Will the Hardys unravel the mysteries?

Eighteen year-old Frank Hardy and his seventeen year-old brother Joe no sooner accept a 'shantytown' beach investigation from Bayport Police Chief Collig when two of their close chums vanish. After a crime occurs which they partially witness and the matter of the same squatter town surfaces again and again, they wonder if all of Bayport's havoc could stem from that one place.

Timber wolves, a Rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the members of a notorious gang responsible for a payroll robbery. In the old Montana mining camp of Lucky Lode, the young detectives puzzle over a series of mysterious events. A piano-playing ghost haunts the long-abandoned dance hall; eerie blue lights flash from the hilltop cemetery in the dark of night; strange men arrange a meeting at Shadow the Bear, and a suspect disappears through a curtain of frozen ice. Are these events related to the men who kidnapped the boys in Chicago on their way to Montana? Who booby-trapped the helicopter which flew the young detectives to the ghost town? And what ever happened to Bart Dawson who seemingly deserted his gold-mining partners twenty-five years ago? Frank and Joe cleverly fit the scattered pieces of this dangerous puzzle into place, and come up with an astonishing solution.

Frank and Joe solve the mystery of the secret locked room in the spooky Dalrymple Mansion. —- For action, mystery and cliff-hanging suspense, read THE HARDY BOYS MYSTERY STORIES® - featuring the thrilling adventures of America's favorite detective duo, Frank and Joe Hardy. Millions of young readers have teamed up with the Hardy Boys, helping them in their quest to bring criminals to justice. Be a part of the fun! Start your collection of original hardcover Hardy Boys® Mysteries today!

The boys once again have jumped into the thick of a complicated mystery. Samuel Blackstone and his brother Ruel Rand live on adjacent properties, and it appears that one of them is out to hurt the other because they are both attacked. Frank and Joe soon learn that treasure is rumored to be hidden between the two properties, and as they investigate, they learn that others are involved in the apparent plot between the two brothers. Spooky mansions, secret passages and rooms, mysterious characters, and a monster provide an enjoyable atmosphere to this Hardy Boys mystery.

Strange events involve Frank and Joe Hardy in a mystery which shrouds an ancient treasure—the golden head of the Pharaoh Rhamaton IV. The owner of the million-dollar golden Pharaoh’s head claims it was aboard the freighter Katawa, which sank not far from Whalebone Island. But suspicious developments indicate that Mehmet Zufar may be trying to defraud the shipping line’s insurance company. Frank and Joe enthusiastically accept the challenge of their famous detective father to assist him in investigating the complex case for Transmarine Underwriters.

Frank and Joe Hardy become involved in an intriguing mystery which revolves around their fencing master, Ettore Russo. Proof that Russo is the rightful heir to his grandfather's estate hinges on retrieving the guard end of a broken saber lost many years ago in California. The young investigators' quest is complicated by a bank robbery during which some of their father's important records are stolen. A chase ensues in the grape-growing region of California as the boys engage in a dangerous game of hide-and-seek with the bank robbery gang.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.