Something is abducting human beings. The vanishings are spreading further and further throughout human-held systems and those responsible leave no traces behind. Their motives and their methods are unknown, and it is not long before Darien, Amber, and the Blink Operatives of Hammerhead Squad are drafted into an interstellar manhunt to find the perpetrators. Chasing down leads on a dozen inhabited worlds, the young operatives soon discover that the truth behind the abductions is more terrifying than any of them could have realised. Embroiled in a galactic game of cat and mouse, they must hunt down whoever is responsible before they themselves become the hunted.