Fired from the police force for insubordination, Peter Diamond is reduced to working as a security guard at Harrod's. Turns out he can't even hold that job--he gets fired after finding an abandoned Japanese girl in the store after closing. "Naomi," as he calls her, exhibits strong signs of autism, and he devotes himself to communicating with her in order to glean her identity and return her to her rightful home. Weeks later, a Japanese woman appears out of the blue to claim the little girl, and it appears as though Diamond's job is done. If only that were true. Armed only with only Naomi's drawings as clues, Diamond races to track down her kidnappers and save her life.