Northern Ireland, spring 1981. Hunger strikes, riots, power cuts, a homophobic serial killer with a penchant for opera, and a young woman’s suicide that may yet turn out to be murder: on the surface, the events are unconnected, but then things—and people—aren’t always what they seem. Detective Sergeant Duffy is the man tasked with trying to get to the bottom of it all. It’s no easy job—especially when it turns out that one of the victims was involved in the IRA but was last seen discussing business with someone from the loyalist Ulster Volunteer Force.

Los Angeles County Sheriff’s Detective Stilwell has been "exiled" to a low-key post policing rustic Catalina Island, after department politics drove him off a homicide desk on the mainland. But while following up the usual drunk-and-disorderlies and petty thefts that come with his new territory, Detective Stilwell gets a report of a body found wrapped in plastic and weighed down at the bottom of the harbor. Crossing all lines of protocol and jurisdiction, he starts doggedly working the case.

When buried bones are unearthed by a storm in North Yorkshire’s picturesque coastal town of Whitby, Black is drawn into an investigation that takes him back to the late eighties and the fiery demise of a popular pub. Frank is no stranger to vulnerability. With a shattered daughter, he lives with it. With an outsider in Detective Inspector Gerry Carver, he works with it. And in Charlotte Wilson, a young, eighteen-year-old musician discarded and buried near the old whalebones of Whitby, he recognizes it.

There's a serial killer targeting the streets of Newcastle, seemingly picking his victims at random but subjecting them all to the same torturous end. When the Chief Inspector on the case goes missing, it falls on DCI Ryan to track down the man who is brutally murdering women and goading the police to 'catch me if you can'. As everyone becomes a suspect, Ryan and his team get drawn further and further into the case, but for Ryan the nightmare gets closer to home than he could ever have imagined.

The body of a young Russian woman washes up on an Icelandic shore. After a cursory investigation, the death is declared a suicide and the case is quietly closed. Over a year later Detective Inspector Hulda Hermannsdóttir of the Reykjavík police is forced into early retirement at 64. She dreads the loneliness, and the memories of her dark past that threaten to come back to haunt her. But before she leaves she is given two weeks to solve a single cold case of her choice.