In a decaying town built around a massive underground structure sealed for centuries, rumors swirl about its purpose—treasure, ancient power, or even a doomsday device. When Tessa, a sharp-witted mechanic, discovers a pendant hidden in her late father's belongings, strange symbols begin appearing around her.

She soon learns she's the last living descendant of the town's enigmatic founder—the only person who can unlock the structure. But she's not alone in her quest. A secretive tech conglomerate seeks to weaponize the structure, a shadowy cult views it as the key to salvation, and a relentless assassin is hunting anyone tied to its secrets. Adding to the chaos, a crew of high-stakes thieves, led by Tessa's friend, arrives with plans for the ultimate score, believing the structure holds untold riches.

As Tessa delves into the founder's cryptic journal, she uncovers a devastating truth: the structure isn't a vault—it's a machine capable of erasing entire timelines. With the thieves triggering a countdown to the machine's activation, Tessa is torn between stopping her old friend and the heist, confronting her father's buried secrets, and preventing the factions from plunging reality into chaos. With the clock ticking, allies turning into enemies, and the lines between loyalty and survival blurring, Tessa must decipher the code and decide: protect the past, rewrite the future, or gamble it all for a second chance to set things right.