Description
Chloe and Lily lead ordinary lives in the quiet town of Upland, California—until a strange black stone is uncovered in their school’s forgotten library archives. Etched with ancient symbols that seem to watch back, the artifact awakens a secret buried for centuries and sets off a chain of events no one was meant to survive.
As the sisters begin decoding its markings, they stumble upon traces of The Society—a powerful, long-hidden global network determined to control history by rewriting it. What starts as curiosity quickly becomes a dangerous game of symbols, encrypted texts, and hidden chambers, each clue pulling them deeper into a world where truth is currency and knowledge is deadly.
With the help of an unlikely team—Gil, a former Israeli special forces operative; Luca, a brilliant Italian hacker with secrets of his own; Yuki, a quiet robotics engineer from Japan; and others—the sisters follow a trail of coded books, encrypted scrolls, and forgotten passageways that lead to an underground chamber erased from official records.
But they are never alone.
The Society is watching every move, willing to silence anyone who gets too close. As danger closes in and loyalties begin to shift, Chloe and Lily must decide who to trust—and how far they’re willing to go to protect a truth powerful enough to change the world.
The Obsidian Eye launches an eight-book, globe-spanning mystery series steeped in history, intrigue, and empowerment. Each installment takes readers to a new international setting as the Sisterhood Sleuths race to stop The Society before the past, present, and future are rewritten forever.






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