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The Mystery of the Propitious Portal
A historic mutiny. A midnight clue. And a family history that time forgot.
The Salvage Yard is still there. So is the secret headquarters. And so are the Three Investigators—smarter than ever, a little older, and ready for their most challenging cases yet.
Conceived and co-written by Elizabeth Arthur, the daughter of Robert Arthur, the creator of the Three Investigators universe, this exciting reboot of the classic series takes its iconic characters into a new age. They return rei-magined, reinvigorated, and more relevant than ever.
In the sixteenth book of a 26-book story arc, when The Three Investigators attend the wedding of their friends Charlotte Mitchell and Connor O'Malley at The Tahitian Ojai Resort in the Ojai Valley, they don't expect to get caught up in a mystery – especially not Bob, who has invited Freya Haldorrson to accompany him on their very first date. Even so, they soon hear about a stranger who tried to break into the resort's library the night before the wedding.
During a treasure hunt, one of the wedding activities, the boys also stumble upon a series of curious events that may or may not be linked to the attempted break-in. Winning the treasure hunt gives them a prize of three days and two nights at the resort, allowing them to follow the trail of clues at their leisure.
Along the way, they meet Otis Wyndham, the 93-year-old owner of a local bookstore, whose colorful past includes dating a burlesque dancer and working as a secretary to Charles Nordhoff, co-author of Mutiny on the Bounty. The resort's owner, it turns out, is obsessed with Nordhoff's history, and to their surprise, a young tennis pro named Heramana Adams is a direct descendant of one of the last surviving Bounty mutineers.
What starts as a simple puzzle turns into an investigation full of fascinating questions. Why did someone steal a book from the library only to return it the very next day? Where have the legendary Tahitian pearls that once belonged to Nordhoff disappeared to? What's the connection between tennis and this treasure hunt? Can Mallory's visual memory unlock the secrets hidden in a series of old photographs? As the Investigators' time at the resort draws to an end with the solution to the puzzle tantalizingly close, Jupiter has a dream that leads him out into the night -– where a new revelation might just change everything.
Join Jupiter, Pete, Bob, and Mallory as they work to solve an 80-year-old mystery full of sinuous twists. As the story unfolds, you'll want to be there as families are reconfigured, villains turn out to be heroes, and a dastardly score in tennis turns out to be the guiding word.
The Salvage Yard is still there. So is the secret headquarters. And so are the Three Investigators—smarter than ever, a little older, and ready for their most challenging cases yet.
Conceived and co-written by Elizabeth Arthur, the daughter of Robert Arthur, the creator of the Three Investigators universe, this exciting reboot of the classic series takes its iconic characters into a new age. They return rei-magined, reinvigorated, and more relevant than ever.
In the sixteenth book of a 26-book story arc, when The Three Investigators attend the wedding of their friends Charlotte Mitchell and Connor O'Malley at The Tahitian Ojai Resort in the Ojai Valley, they don't expect to get caught up in a mystery – especially not Bob, who has invited Freya Haldorrson to accompany him on their very first date. Even so, they soon hear about a stranger who tried to break into the resort's library the night before the wedding.
During a treasure hunt, one of the wedding activities, the boys also stumble upon a series of curious events that may or may not be linked to the attempted break-in. Winning the treasure hunt gives them a prize of three days and two nights at the resort, allowing them to follow the trail of clues at their leisure.
Along the way, they meet Otis Wyndham, the 93-year-old owner of a local bookstore, whose colorful past includes dating a burlesque dancer and working as a secretary to Charles Nordhoff, co-author of Mutiny on the Bounty. The resort's owner, it turns out, is obsessed with Nordhoff's history, and to their surprise, a young tennis pro named Heramana Adams is a direct descendant of one of the last surviving Bounty mutineers.
What starts as a simple puzzle turns into an investigation full of fascinating questions. Why did someone steal a book from the library only to return it the very next day? Where have the legendary Tahitian pearls that once belonged to Nordhoff disappeared to? What's the connection between tennis and this treasure hunt? Can Mallory's visual memory unlock the secrets hidden in a series of old photographs? As the Investigators' time at the resort draws to an end with the solution to the puzzle tantalizingly close, Jupiter has a dream that leads him out into the night -– where a new revelation might just change everything.
Join Jupiter, Pete, Bob, and Mallory as they work to solve an 80-year-old mystery full of sinuous twists. As the story unfolds, you'll want to be there as families are reconfigured, villains turn out to be heroes, and a dastardly score in tennis turns out to be the guiding word.
316 pages, Hardcover
Published June 3, 2026
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