Despite their skepticism, the police call in memory researcher Dr. Jasmin Braun to question each of the kidnapping witnesses.

Braun interviews student Johanna Weiher, who possesses keen powers of observation but also has a tendency to tell tall tales.

Either museum guard Amin Halba or members of his extended family are involved in the kidnapping; the news that Emma is without her important medicine means Braun needs answers fast.

With Braun's help, the unstable Theresa Stern recalls seeing her boyfriend in the hallway of the museum but refuses to reveal his identity.

While the police pursue a suspect, Braun talks to renowned psychologist Max Felsner, who is one of the man's lecturers.

In exchange for Emma's life, the kidnapper demands an explanation for the death of Laura Rohloff; Braun interviews a witness who was the suspect's former neighbor, Ruth Meller.