Translations for hush in French

Here are paragraphs from public domain books translated:

"It must stop here, however," said Bradstreet. "If the police are to hush this thing up, there must be no more of Hugh Boone."	— Maintenant, il faut en finir, dit Bradstreet. Si la police doit faire le silence sur cette affaire, Hugues Boone doit disparaître.
The Adventures of Sherlock Holmes, by Arthur Conan Doyle	Les Aventures de Sherlock Holmes, de Arthur Conan Doyle