The Hardys purchase a Chinese junk to use as a ferry service, in order to make some money over the summer. It soon becomes apparent that others are very interested in the ship.

The Canadian Northwest beckons Frank and Joe Hardy to mystery and adventure. It all starts when a French-Canadian trapper, Caribou Caron, makes a historical and valuable find–-a carved rune stone left by Vikings centuries ago near Great Slave Lake. When Caribou Caron attempts to sell the artifact to a representative of a museum, it is snatched by thieves. Like the intrepid Vikings of old, Frank and Joe, with their close pal Chet Morton, set off on a perilous quest in the Northwest Territories to recover the valuable artifact before the robbers can decipher the symbols leading to the buried treasure.

When Frank and Joe Hardy receive a telegram from Tony Prito in Alaska telling them that his life is in jeopardy, they immediately make plans to fly to Tony’s rescue. Unknown enemies dog the Hardys and their pal Chet Morton even before they start the 4,000 mile journey. Puzzling questions lead the Hardys into dangerous sleuthing in the wilderness of Alaska and British Columbia. The astounding secret that the young detectives uncover, in the shadow of the forbidding mountain peak Devil’s Paw, winds up one of the most perilous adventures they have ever encountered.

When she is told that a large inheritance from a Greek tycoon, meant for her friend Helen Nicholas, was stolen, Nancy agrees to find the culprit. A poisonous snake in a basket of apples and a strange symbol stamped on a rare Byzantine mask are clues in this mystery set in the beautiful and exotic country of Greece. These clues lead Nancy and her friends to a ring of art smugglers and to the secret of the Greek symbol.

The Hardy Boys series, first published in 1927, has sold more than 70 million copies! Now with a brand-new look, this is an edition that collectors won't want to miss! In The Secret of the Old Mill, the third book in the incredibly popular, long-running series, Frank and Joe Hardy are on the case to bust a counterfeit money ring. A special treat for Hardy Boys fans and any reader who's new to the series.

Gold! There are rumors that long ago a treasure was hidden in a city now buried under the Nevada desert. Nancy and her friends plan to join a dig sponsored by two colleges to hunt for the gold. Before she starts, the young sleuth receives an ancient stone table with petroglyphs on it. With this amazing clue, however, come a threat and danger from a thief who also wants the treasure. One harrowing adventure after another besets Nancy, Bess, George, Ned, Burt, and Dave in 102-degree temperatures as they pursue Nancy’s hunches above and below ground. They are assisted by a fine woman and a young geology student, but both are unwilling participants in a strange plot. In the end Nancy and Ned nearly lose their lives, just after she has discovered the priceless hidden treasure of gold.

An invitation from Cap Bailey, science teacher at Bayport High, to accompany him out West to Wildcat Swamp on an archaeological expedition triggers off a series of dangerous events for Frank and Joe Hardy. On their way West the boys and Cap have a near-fatal accident in a private plane which has been sabotaged. Though warned to leave the area, Frank, Joe, and Cap doggedly remain until they have caught the cunning ex-convicts they are up against in this swift-paced adventure.

Aunt Eloise Drew invited Nancy and her friends to Mirror Bay Bide-a-Wee cabin near Cooperstown, New York, for a visit and a chance to solve the mystery of the woman who glides across the water. Upon their arrival, Nancy becomes mixed up in a vacation hoax and is nearly arrested for fraud. On the wooded mountain near the cabin further exciting events await Nancy and the other girls. In the deep forest, a weird luminescent green sorcerer appears who threatens to cast an evil spell on anyone investigating his strange activities. In a dangerous twist of circumstances Nancy finds that solving one mystery helps to solve another. What happens when the young detective and her friends uncover a cleverly concealed criminal operation?

In a series of hair-raising adventures both on land and undersea the teenage brother detectives pit their wits against some of the most ruthless criminals they have ever encountered. It all starts when Frank and Joe are skin diving just for fun and the thrill of exploring the undersea world. Suddenly, deep in the waters that flow near the foot of Pirates’ Hill, a mysterious skin diver fires a spear through Frank’s air hose. From this moment on, danger is never far away. The very lives of the boys are at stake as they, along with the help of their pals, uncover a mystery involving an old Spanish cannon and a fabulous sunken treasure.

Nancy and her friends, Bess and George, meet Joanne Byrd on a train ride home. Joanne lives at Red Gate Farm with her grandmother, but if they do not raise enough money to pay the mortgage, they will soon lose the farm! Nancy, Bess, and George decide to stay at Red Gate for a week as paying customers. Soon, they learn about the strange group of people who rent a cave on the property. They describe themselves as a nature cult called the Black Snake Colony. Nancy investigates their group and helps to uncover a ring of counterfeiters in town!