Translations for imminent in French

Here are paragraphs from public domain books translated:

"Do not lose an instant. And, above all, take care of yourself in the meanwhile, for I do not think that there can be a doubt that you are threatened by a very real and imminent danger. How do you go back?"	— Ne perdez pas un instant, et surtout veillez sur votre sécurité car vous êtes certainement menacé par un réel et imminent danger. Comment allez-vous rentrer ?
The Adventures of Sherlock Holmes, by Arthur Conan Doyle	Les Aventures de Sherlock Holmes, de Arthur Conan Doyle