Books in Hardy Boys Casefiles, No 23 series

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Frank and Joe, in Tunisia for the anniversary of the Explorer's Guild, search for a killer in their midst when Thor Sonderstrom, who funds the expeditions, is mysteriously poisoned and secrets, hatreds, and dangers lurk in every corner. Original.

When Frank and Joe take jobs at the Bayport Arena for spring break, they befriend heavy metal rocker Buddy Death, who has been receiving threats on his life

Searching for Sanjay, the son of a New York City jeweler, the boys learn that Sanjay is planning to elope with the niece of his father's archenemy, and that ten thousand dollars in gold is also missing. Original.

Witnessing a bank robbery, Frank and Joe are baffled by the masked gang's near-perfect heists, and when Vanessa offers a surprising source of information, the Hardy boys must protect her from the gang. Original.

While working security at the World Snowboarding Championships in Austria, Frank and Joe must protect top competitor Ken Gibson from underworld figures who are out to get him

Frank and Joe are enjoying the awesome beauties of Alaska's Denali National Park when a series of potentially disastrous forest fires--deliberately set--pit them against more than nature. Original.

An omnibus edition of three Hardy Boys cases finds the brothers peering into corruption in the Bayport police department, deadly doings in a professional beach volleyball tournament, and danger on the ski slopes. Original.

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On a salvage operation off the coast of Florida, the Hardys discover a sunken Nazi U-boat and its deadly secrets, and are soon fighting off a deadly adversary. Original.

Gathers three previously published stories from the Hardy Boys Casefiles series, Rock 'n' Revenge, Choke Hold, and Uncivil War, in which Frank and Joe try to find out who turned a Civil War reenactment into the real thing. Original.

The Hardys travel to Idaho to learn the wilderness sport of orienteering, but Frank, Joe, and their instructor, Rob Niles, run into some treacherous terrain, and their courage and resourcefulness are stretched to the limit. Original.