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The Mystery of the Ubiquitous Undertow
Hardcover
Series: New Three Investigators, Book 21
ISBN13: 9781965321614
Publisher: Hollow Tree Press
Published: Nov 3 2026
Pages: 332
Weight: 1.17
Height: 0.88 Width: 5.50 Depth: 8.50
Language: English
A deadly game on Spyglass Hill. A story erased at Fort Ord. And a secret submerged in the Devil's Cauldron.
Step into mysteries that demand courage, discernment, and the will to seek the truth. Conceived and co-written by the daughter of Robert Arthur - the creator of the Three Investigators universe - this restoration of the classic series takes its iconic characters into a new age, with gripping contemporary adventures for young readers who crave meaning, want to share in the growth of characters they admire, and seek a world they can return to again and again.
In the twenty-first book of a 26-book story arc, Jupiter and his friends are invited to visit Jupiter's mentor, Septimus Halfpenny, at his vacation house on the Monterey Peninsula. But before they leave, Jupiter becomes intrigued by an old, unsolved murder: a man found dead on the Spyglass Hill golf course, a black spot pinned to his chest, and a strange hourglass-shaped drawing on the back of a note. The note mentioned a place called the Devil's Cauldron - a real coastal formation near Point Lobos.
On the road to Pacific Grove on their brand-new motorbikes, the team stops at Point Lobos and meets a group of high school swimmers sponsored by a mysterious Vietnamese woman with a pointed interest in The Three Investigators. At Spyglass Hill, Jupiter interviews the original groundskeeper and uncovers more unsettling contradictions.
Meanwhile, Bob and Mallory encounter charismatic war correspondent Harrison Rose and his famous mother, actress Miranda Rose - both of whom seem to know more than they're willing to say. At the big Victorian house Septimus is renting, the team senses old secrets.
The team soon discovers that nearby Fort Ord, now decommissioned, was once a major departure point for soldiers headed to Vietnam - and that the murder on the golf course may be tied to a party held there during the height of the war. What did the hourglass symbol really mean? Who was the victim? And why was his death still unsolved? Could the answers be hidden in the forgotten history of the army base?
As they unravel the threads, The Three Investigators must confront the troubling truth about the dead man on the golf course and the significance of the black spot and the Devil's Cauldron.
Join the Three Investigators as they uncover a mystery full of twists, surprises, and secrets from the past. Can they solve the riddle - and do they want to? - before the truth is lost to time? And can Jupiter parse the difference between justice and the law?
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