The Secret of the Cavern. Harrow Harbor Mysteries, #2

Danger runs deep in Harrow Harbor. When siblings Mia and Carter Blake discover glowing symbols on an underwater wreck near Black Hollow, they're thrust into another mystery tied to the legendary Silver Phantom. With Scarface and Dr. Rhodes closing in, the siblings must outsmart their enemies to uncover the truth about the ship's ancient secrets. Their journey begins in the eerie depths of a hidden cavern, where strange carvings and a forgotten map point them toward danger.
As Mia and Carter follow the clues, they realize that every artifact they find brings them closer to solving the riddle of the Silver Phantom-and closer to the ruthless forces determined to unlock its secrets first. But the wreckage holds more than just treasure. The artifacts are more than relics-they're part of a powerful system, and in the wrong hands, they could unleash devastating consequences.
Racing through treacherous waters, collapsing caves, and violent whirlpools, Mia and Carter face life-threatening challenges as they piece together the truth behind the Silver Phantom. With Naomi's tech skills, Carter's quick thinking, and Mia's daring plans, the siblings are determined to stay one step ahead of their enemies. But Scarface and Rhodes are relentless, and the stakes have never been higher.
As ancient forces awaken beneath the waves, the Blakes must risk everything to protect the truth-even if it means diving headfirst into the unknown. The second installment in the Harrow Harbor Mysteries, The Secret in the Cavern, delivers pulse-pounding adventure, clever puzzles, and a thrilling underwater world filled with danger and discovery. Perfect for fans of Nancy Drew, The Hardy Boys, and middle-grade mysteries packed with action.