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agent private surprise affair hide skeleton in closet oyster scheme unsecret bewrayingly secrets semisecret button one's lip overt take something to grave penetralium prevarication secrecy recondite cant secretly round regrade give away secrete cloak and dagger eyeballer let slip classified mum intel backstair breathe word in camera mysteries mystery skeleton in cupboard collusion steganography bonesman public key cryptography tip one's hand by end hidden know nothing make known counterdeed undisclosed clandestinely cryptonym cabalism hugger mugger investigate let something slip crypto cabal pseudosecret underhanded steal disembosom ballot bare one's soul closet courtly love classify priest hole in petto confidence intriguer concealment industrial espionage murdrum closeted sieve sneaking know where bodies are buried hush up clout list confidentiality secret sauce knowledge covert earwig penetralia smoke filled room back street cardan grille initiation ceremony workname oddfellow closed adoption carbonari arcanist keep one's mouth shut shit stirrer dead men tell no tales slip keep one's lips sealed arcane skeletons intelligence judeo masonic backstairs scopophilia hideling something nasty in woodshed closed book rubber hose cryptanalysis top secret ultrasecret keep quiet occult under one's hat under table ramasi machinate kerckhoffs's principle confidential get wind of st giles greek stitch up whisperer conclave supersecret privily well kept under covers shoot off at mouth clandestine genital pedophocracy epopt samizdat organ nicodemite iraqgate cryptoracist keep shtum repository keep mum sensitive crambo marranism trapdoor clearance rotwelsch intriguingly squawk dark sphinx secretary skoptsy arcanum let cat out of bag recluse bulls and cows keep lid on hele hole and corner secure intrigue ace in hole backstage off record plot unrevealed cryptarchy undercover heartburning nonsecret cryptadia conceal secret sharing synchromysticism harpocrates secretion monitorial undercode spy money spill beans divulgation on down low honey trap scopophile keep one's counsel let in on mysteriosophy crypto fascist underhand underpull crypto fascism éminence grise illuminati monitor underwrapped clandescent hieroglyphic word club code lair navy garden alias bed trick crush commode cocktail elopement case spook desire success sauce