While searching for the sign with the three frogs, Nina is surprised that she knows the surrounding buildings and streets, but there is a shadow of fear in her memories. Meanwhile, Tenma and Grimmer get an important testimony from Lanke. Inspector Lunge takes a holiday in Prague.

Inspector Lunge arrives at the Red Rose Mansion after finding a hint in a picture book. Afterwards, he meets with Captainl Lanke, a leader of the former Czechoslovakian secret police.