Nobody is really looking forward to Christmas this time, and someone is up to mischief with naughty pranks. Sascha gets to the bottom of the matter and learns that the pranks are the work of Rosalinde, the fourth of the Christmas elf sisters. Fourth elf? Rosalind has fallen out with her sisters and casts a curse that turns all Christmas creatures into children. Now Christmas is in danger!

After taking several years off to have children, nurse Clara Horn returns to work and begins to feel the effects of the much tougher daily routine at the clinic - pressure, stress and tension are the order of the day. But she soon realizes that there is much more going on in her clinic: Apparently, one of her colleagues is deliberately killing patients. Clara must overcome not only her own doubts, but also massive resistance among her colleagues in order to convict the perpetrator, Rico Weber.

The story of a married but separated couple Matthias and Anna, although the wounds are still open, together planning the birthday-party of their son Lukas. When, at the end of the party, little guest Julius isn't picked up by his parents, a rapid chain of events take place.

After having a chance encounter with a mysterious character, Wendy, a young working class mother, discovers that she has super powers.

A man and his ship are sunk in Lake Constance and the dead man's son is missing. For the detectives, he is the prime suspect. Until an anonymous tip-off about a prisoner hidden in a box turns up...

It's been five years Martin's family vanished without a trace from a cruise ship. Ever since, the police psychologist is tortured by the thought of his wife having committed a murder-suicide, taking their son with her. He is the only one not willing to believe this. Suddenly, a new lead takes him back aboard the very same luxury cruiser, where once again, a mother and her child have vanished. But this time, the girl reappears - holding a teddy bear that used to belong to Martin's son. Martin soon learns that things are handled differently on the open sea. Not to disturb his passengers' enjoyment of the lavish luxuries of their cruise, the rich owner of the cruiser wants to keep the child out of sight and hides her deep under deck in the quarantine bay. Here, Martin tries to get the traumatized girl to talk to him. But even deeper in the dark underbelly of the ship there is something lurking. And all signs point to a serial killer, just waiting to strike again.

Sandra and Ulrike have to decide the fate of their mother, who falls into a coma due to a ruptured aneurysm and has to be connected to life support machines.