Two gruesome homicides preoccupy Det. Sgt. Diane Fry and Det. Constable Ben Cooper in Booth's ambitious seventh police procedural (after The Dead Place
). In England's Peak district, Fry looks into a suspicious house fire that killed Lindsay Mullen and two of her young children, while her husband, Brian, escaped with minor injuries. Meanwhile, Cooper investigates the death of Rose Shepherd, a reclusive woman killed by an apparent sniper-shot through her bedroom window. Both cases yield few clues, and Fry and Cooper run into one dead-end after another. While the link that they eventually uncover between the murders of Shepherd and the Mullens and a notorious Bulgarian gang stretches credulity, Booth compensates with his energetic pace and memorable characters. Genre fans may find a subplot involving psychotic hallucinations clichéd, but few will be able to predict Booth's twisted conclusion. (May)