Columbia subject headings:
Children--Crimes against--Fiction.
Detective and mystery fiction.
Extortion investigation--Fiction.
Olympic Games (30th : 2012 : London, England)--Fiction.
Private investigators--England--London--Fiction.
Witnesses--Fiction.
Harvard subject headings:
Detective and mystery fiction.
Private investigators--England--London--Fiction
Princeton subject headings:
Fiction.
Private investigators--England--London--Fiction.