A long way down

All signs point to murder when a wealthy businessman plummets from his office window, but with no evidence, witness, or apparent motive, the investigation becomes a cold case. Months later, Detective Inspector Sep Black of the Cold Case Unit is approached by an attractive widow who wants him to look into the murder of her husband, a reporter who seems to have been close to breaking a big story, for which someone had him killed. Black discovers the connection between the two murders, then an attempt is made on his own life.