Stalker

A Joona Linna novel,
by Lars Kepler, a pseudonym for a husband-and wife team, Alexandra Coelho Ahndoril and Alexander Ahndoril, Sweden
translated by Neil Smith.
The Swedish National Crime unit receives a video of a woman in her home. Hours later, they discover her mutilated body. Soon after, the killer sends another tape, taunting the police. He knows there's nothing they can do.
Only Joona Linna and his old friend Erik Maria Bark can stop this cunning predator, but Bark is hiding secrets of his own - secrets the killer knows. Fast-paced and frightening.
Paperback, 552pp. 2014/Eng2016