It's a dark night in Stockholm. A chef is murdered in his own kitchen and Martin Beck gets on the case.

Two patrolling cops stumble on to three criminals who have just stolen large amounts of explosives, and are killed in cold blood. Martin Beck and his team must now work day and night to find out who the killers are and what they are planning to do with the explosives before it's too late. Meanwhile, Gunvald Larsson who was a close friend of one of the murdered cops is ignoring all rules in his quest for revenge.

c/o Segemyhr was a Swedish sitcom that premiered on TV4 Sweden on 4 September 1998. The series took place in and around an apartment in an exclusive neighbourhood in Stockholm, Artillerigatan 35 and later Styrmansgatan 52 in the same area. The series began with three seasons from fall 1998 to fall 1999, thereafter additionally two seasons were added in 2003–2004. All seasons have been released on DVD. Script writers were Fredrik Lindström och Erik Haag.

When the police reveal a narcotic smuggling the driver is shot dead. It appears that the driver is Superintendent Martin Beck's son. Beck breaks down and moves out of the way. But on his colleagues request he returns.