sleuth 
/ˈslu:θ/ noun
plural sleuths /ˈslu:θ/ noun [count] old-fashioned : someone who looks for information to solve crimes : detective
▪ a clever sleuth
▪ a clever sleuth
— sleuth·ing /ˈslu:θɪŋ/ noun [noncount]
▪ He did some sleuthing to see if he could turn up any clues.
/ˈslu:θɪŋ/ noun [noncount] ▪ He did some sleuthing to see if he could turn up any clues.
