The action swings from London to Sweden, and then back into the past, to Franco’s Spain, as Roy & Castells hunt a monstrous killer … in the latest instalment of Johana Gustawsson’s award-winning series   ‘A satisfying, full-fat mystery’ The Times   ‘Assured telling of a complex story’ Sunday Times Crime Club   ‘Gustawsson’s writing is so vivid, it’s electrifying. Utterly compelling’ Peter JamesSpain, 1938: The country is wracked by civil war, and as Valencia falls to Franco’s