|Spoiler Warning: Plot details, ending details, or both are in the text which follows.|
The Door to Nightmares is the forty-seventh episode of the anime.
Tenma and Grimmer visit the hospital were Jan Suk is being treated, but they find out that he is not there. Grimmer tells Tenma about the tape that he and Suk listened to earlier about Johan being interviewed when he was in Kinderheim 511.
Tenma and Grimmer are driven to Karel Ranke, a former Captain of the Czechoslovakian Secret Police. Ranke explains that Suk is safe and offers them a deal: the tape and files in exchange for Suk, since a German friend of his is interested in buying them. Ranke also tells that the blonde girl who apparently killed Mikhail Petrov and the three police officers has no relation with him or his organization.
Ranke shows Grimmer a picture of his nephew, Adolf Reinhart, who was also in Kinderheim 511 in the early sixties. Grimmer remembers him and how he was kind to him. Regarding the tape, no agreement is reached and Tenma and Grimmer leave.
Nina and Dieter arrive to Prague, and Nina is confused when people start calling her Anna. Nina visits the Tři Žába, which triggers her memories of her childhood including reading the picture book Obluda, a mysterious man and the stairs of the inn.
Tenma and Grimmer meet again with Ranke. Grimmer tells Ranke that he will not give nor the documents or the tape, but that he will let him listen to the cassette under one condition: that he forgets about selling them and that he listens to the tape only for personal use.
Ranke tells Tenma and Grimmer about Franz Bonaparta, a man part of the Czechoslovak Secret Police who used to have a mansion. Ranke informs them that Bonaparta was the author of a very popular children's picture book, The Monster Without a Name.