Seven is a thief with a difference - he steals downloadable memories from banks and memoriums to sell onto London's black market, trading secrets and hidden pasts for a chance at a future of his own. One night, while breaking into a private memorium in a wealthy part of London, he's caught in the act by one of its residents; Alba, the teenage daughter of London's most famous criminal prosecutor. Instead of giving him away, Alba promises to keep Seven's secret - as long as he allows her to go memory-surfing herself. In doing so, they discover a hidden memory about Seven's past, revealing a shocking secret about his childhood, the government and a mysterious experiment known as the Memory Keepers.