It is only the beginning of May, but in Oslo a brutal heat wave has coincided with an alarming increase in violent crime. In the latest instance, police investigator Hanne Wilhelmsen is sent to a macabre crime scene on the outskirts of town. An abandoned shed is covered in blood. On one wall an eight-digit number is written in blood. There is no body--nor any sign of a victim. Is it a kid's prank or foul play? Is it even human blood? As more bloody numbers are found in isolated locations throughout Oslo, Hanne's colleague Håkon Sand makes a startling discovery: the digits correspond to the filing numbers of foreign immigrants. All are female, all are missing. Is there a serial killer on the loose in Oslo?
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