English version

cloak-and-dagger

From Longman Dictionary of Contemporary Englishcloak-and-daggerˌcloak-and-ˈdagger adjective [usually before noun]  SECRETvery secret and mysterious, and usually involving the work of spies a cloak-and-dagger operation
Examples from the Corpus
cloak-and-daggerHis enthusiasm for the cloak-and-dagger business of detection seemed to have waned.He was arrested after a cloak-and-dagger operation involving the CIA and MI6.
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