Your decisions shape the fate of an 86-carat diamond as thieves, killers, and con men tear through London's underworld. One punch can change everything—and every dog has its day.

Sixteen-year-old Astrid, an agent of the covert espionage agency Delta, has lived a life steeped in gunshots, martial arts, and a whirlwind of languages. But her world, defined by the grim realities of a teenage spy, is about to be irrevocably altered. A new assignment plunges her into the dangerous underworld of a drug dealer in France, unearthing figures from her past in the most unexpected ways. Amidst the chaos, a blue-eyed boy emerges, a perplexing enigma who could be her closest ally or deadliest foe. This mission promises to be unlike any other, dragging her into a spiraling descent towards pure hell. Welcome to Delta. Once you're in, there's no getting out.