cloak–and–dagger adjective
: relating to or showing actions or behavior in which people or governments try to protect their important secrets or try to learn the secrets of others
▪ a cloak-and-dagger novel ▪ cloak-and-dagger [=undercover, secret] operations
▪ a cloak-and-dagger novel ▪ cloak-and-dagger [=undercover, secret] operations
