The Roy & Castells series by Queen of French Noir Johana Gustawsson (Books 1-3 in the addictive, breathtaking, award-winning series: Block 46, Keeper and Blood Song)

Get the first three books in the addictive, award-winning, number-one bestselling Roy & Castells series, in one GREAT-VALUE Box Set! Emily Roy, a profiler on loan to Scotland Yard from the Canadian Royal Mounted Police, joins French true-crime writer Alexis Castells on the hunt for serial killers, in cases that take them from London to Sweden and back to the past … to some of the most horrific periods of modern history. 'A bold and intelligent read' 

Guardian 'A satisfying, full-fat mystery'  Sonra