When Germany is hit by a drought, the Ruhr area is threatened with the collapse of drinking water. Meteorologist Martina Fechner is appointed head of the crisis team, but has to recognize that her colleagues see the crisis as an opportunity for their own career. When even highly toxic germs are discovered in a reservoir, the region is also threatened by a plague.

Katrin is a single mother of twins. When they find out that they owe their existence to a sperm donation, they persuade their mother to find their biological father.

Nuclear security expert Katja Wernecke (Ulrike Folkerts) helps cover up a fire in the German nuclear reactor she works in, before the government takes a decision on extending the usage license for it. But the press uncovers it. PR man Steffen Stratmann (Matthias Koerbelin) is brought in to improve the companies image - but before he can implement his plan a nuclear meltdown occurs. 2m people have to be evacuated. Wernecke re-enters the hot zone to investigate the cause...

A murderer always kills across Europe according to the same pattern: he kills single women and provides the victims with his personal signature. A friend of Abel's is suspected. Abel wants to help him and investigates himself.