When a runaway steals a , the Gems are sent to the to find him, only to discover the sample he carries could . But if Venomous finds it first, then the world's new future will come with . Olivia leads the Gems into Barcelona's , an area of narrow medieval streets and dark alleyways to find a who unwittingly holds the secret to . But to win the boy's trust, Olivia must face her own is the sixth novel in , although all books in the Gems world can be read as standalone adventures. This is a story of , ruthless spies, dangerous dead-ends, gorgeous settings, a fast-paced plot with twists and turns, and