William Arden Books in Order

A top-secret experimental drug vanishes from a pharmaceutical lab, and Kane Jackson is called in to find out how. Rivalries, hidden agendas, and a rising body count make the case far more dangerous than it first looks.

While staying at a California ranch, Jupiter, Pete, and Bob investigate eerie wails from El Diablo's cave. Local legend, hidden danger, and a long-buried secret turn a spooky outing into a real case.

A gold amulet, a cry for help, and a strange laughing shadow pull the boys into a hunt for lost treasure. The clues seem impossible until Jupiter begins to see the pattern behind them.

A missing agreement between two giant corporations turns into a deadly hunt for spies, thieves, and hidden loyalties. Kane Jackson must untangle the deal before he becomes the next target.

After a thief grabs a crooked stuffed cat at a carnival, the boys suspect it points to something far more valuable. Their search leads through showmen, sideshows, and a carnival full of traps.

Hired to check out a company before a buyout, Kane Jackson expects routine work. Instead he finds blackmail, murder, and political rot that stretches all the way to Washington.

Kane Jackson goes undercover inside a violent radical cell using a chemical plant as cover. After an explosion and a murder, he has to risk everything by going back in to expose the killer.

Asked to recover a countess's late brother's belongings, the Three Investigators discover that a pile of old junk may hide a fortune. The trail leads straight into a dangerous art forgery scheme.

When plans for inventor Cassius Warsavage's pollution-free rotary engine are stolen, Kane Jackson follows the trail from New York to Georgia. The deeper he digs, the more greed, market games, and danger close in around him.

Bob Mitchell and Rita Valdez find a poisoned condor, and the evidence points toward Rita's own father. To clear his name, they have to uncover who really wanted the great bird dead.

A long-lost sailor's journal sends the boys after pirate treasure at Phantom Lake. Old legends, eerie warnings, and an unseen rival make the treasure hunt a lot riskier than it sounds.

Dingo Towne leaves his fortune to whoever can solve six riddles and find it first. The boys join the scramble, but the clues come with booby traps and some very determined rivals.

The boys are asked to track down an ancient bronze statue that seems to keep vanishing from owner to owner. Chasing the Dancing Devil means untangling theft, rumor, and a mystery that looks almost supernatural.

The Alvaro family is close to losing everything, and only a missing jeweled sword may save their ranch. A clue hidden in a headless horse statue gives the boys one last chance to find it.

Jupiter is kidnapped because he looks like the son of a foreign political leader. Pete and Bob race to untangle the mistake before both boys vanish for good.

During a protest trip near an offshore oil platform, the boys stumble into sabotage, a wartime secret, and a dangerous diver. Sharks, storms, and corporate pressure make every lead harder to follow.

Searching for the Purple Pirate's buried treasure, the boys find intruders already prowling the old hideout. Pirate legend and present-day danger collide as they try to stay ahead of modern treasure hunters.

Car windows are shattering all over town, with no culprit ever in sight. The boys devise trap after trap, but the invisible vandal always seems to know their next move.

At a family reunion on a California island, the boys discover their photographs matter to someone else far too much. Old wrecks and a fresh boating mystery soon turn a vacation into an investigation.

When Jupiter's cousin is arrested in a car-theft case, the Three Investigators start pulling at the loose threads. Their search leads to a nightclub band and a larger operation hiding behind fast cars and music.