It is Midsummer's Eve. Three young friends meet in a wood to act out an elaborate masque. But, unknown to them, they are being watched. Each is killed by a single bullet. Soon afterwards, one of Inspector Wallander's colleagues is found murdered. Is this the same killer, and what could the connection be? In this investigation, Wallander is always, tantalisingly, one step behind.

It was a crime of senseless violence. On a cold night in a remote Swedish farmhouse, an elderly farmer was bludgeoned to death, his wife left to die with a noose around her neck. As if this didn't present enough problems for Ystad police inspector Kurt Wallander, the dying woman's last word, his only tangible clue, were foreign. If publicized, they could be the match that would inflame Sweden's already smoldering anti-immigrant sentiments.

Fredrik Welin is a 70-year-old retired doctor. Years ago he retreated to the Swedish archipelago where he lives alone on an island. He swims in the sea every day, cutting a hole in the ice if necessary. He lives a quiet life. Until he wakes up one night to find his house on fire. Fredrik escapes just in time, wearing two left-footed wellies, as neighbouring islanders arrive to help douse the flames. All that remains in the morning is a stinking ruin and evidence of arson.

Herbert Molin, a retired police officer, lives alone in a remote cottage in northern Sweden. Two things seem to consume him; his passion for the tango, and an obsession with the "demons" he believes to be pursuing him. Early one morning shots shatter Molin's window- by the time his body is found it is almost unrecognisable. Stefan Lindman is another off-the-job police officer.

London is in lockdown under martial law. A hospital is being urgently built by the river Thames to contain the thousands of victims of a flu-like epidemic. Construction is brought to a sudden halt when a leather holdall containing the bones of a child is unearthed from the rubble. A psychopath has been unleashed on the city; his mission is to take all measures necessary to prevent the bones from being identified. But why are he and his handlers determined to go to such murderous lengths to hide the origins of the body?