Knock Knock

At the start of Knock Knock, a heart-pounding thriller by Ander Roslund (co-author of Box 21), young Stockholm police officer Ewert Grens responds to a residential noise complaint. A disheveled five-year-old girl answers the door and Grens discovers a macabre murder scene. The child witness is too young to explain what happened to her family, and the killers were too smart to leave behind any clues. The police place the girl in witness protection, and the murder eventually becomes a cold case. Seventeen years later, a break-in occurs at the house where the murder happened, but the new tenant reports nothing stolen. When Detective Superintendent Grens delves into police archives for the old case file, the folder is missing.

Across town, on the same day as the break-in, the son of businessman Piet Hoffman receives an odd toy in the mail. Upon closer inspection, Hoffman realizes it's a hand grenade. Then, a ringing burner phone arrives on his doorstep. A voice on the phone threatens to reveal his previous life as a police informant, which would result in the almost certain deaths of Hoffman and his family at the hands of the weapons cartels he once infiltrated. The voice says Hoffman's only out is to start a turf war between the cartels. Hoffman and Grens begin a deadly race to expose police corruption and save Hoffmann's family, as well as finally solve the cold-case murder.

Roslund's serpentine plot and visceral character development brings each cliffhanging chapter to a staggering revelation on how tasty a dish of cold, karmic revenge can be. From the first Knock Knock on the door of a murder scene to discovering the killers behind it, this novel is a breathless, suspenseful read. --Paul Dinh-McCrillis, freelance reviewer

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