Fasten your seatbelts for a quality thriller . . . Hall's Gold Dagger-nominated books, quite simply, get better each time. Part of it is the former barrister and TV producer's ability to structure and deliver a thriller that has you keep turning the pages. But Hall is also a hit upon a genuinely fascinating aspect of the justice system . . . The most compelling element of Hall's books, however, is Cooper herself . . . It is wonderful stuff, chillingly plausible Independent on Sunday