cloak-and-dagger
cloak-and-dagger {adj.}
Of or about spies and secret agents.
It was a cloak-and-dagger story about some spies who tried to steal atomic secrets.
The book was written by a retired colonel who used to take part in cloak-and-dagger plots.
(From the wearing of cloaks and daggers by people in old adventure stories.)
Compare: BLOOD AND THUNDER.
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Source: A Dictionary of American Idioms
