In a big city, Vera (28), who is depressed and numbs her nightmares with drugs, performs a last service for lonely people in need of care. On the edge of legality, she accompanies them to suicide. For reassurance, she always sings an old lullaby from her childhood to the dying. Her next assignment leads her to Gerda (80), who is suffering from dementia. She is bedridden and lives alone. Her son Marvin (50), who is financially on the brink, asks Vera for help. Vera hesitantly agrees, but something seems to be wrong.

The next day Vera comes back to carry out her mission. Marvin leaves the house as agreed. Alone with Gerda, Vera prepares the deadly potion. When she sings the old lullaby before administering the poison, Gerda recognizes the song. It turns out that there is a mysterious connection to Vera’s family. Gerda gives Vera a riddle and only when she is able to solve it will she learn everything. When Vera sets out in search of the solution to the mystery, Marvin returns and the situation is in danger of escalating.