Rearranging the letters of 'The Detectives' gives:
Detect thieves.
(by Jean by hand) (1999)
Other related anagrams without their own page:
"Arthur Conan Doyle's Sherlock Holmes" -> "Sleuth soon checked any small horror." (by Hans-Peter Reich using Anagram Genius) (2004)
"Detective" -> "Vet deceit." (by Segura using Anagram Genius) (2001)
"Sherlock Holmes (Private Detective)" -> "Top crime solver. He tackled thieves." (by Jean by hand) (2005)
"Legendary detective Sherlock Holmes" -> "Ergo, he's namely the oldest (clever) dick." (by Ritchie Hardin using Anagram Genius) (2003)
"A collection of Sherlock Holmes detective stories." -> "Coveted crime classics tell of hooknose title-hero." (by Tony Crafter using Anagram Genius) (2009) (pending approval)
"Ace Sleuth Sherlock Holmes" -> "A Homer's cheesecloth skull." (by Jim Banholzer) (2009) (pending approval)
"Ace Sleuth Sherlock Holmes" -> "Electroshock mushes a hell." (by Jim Banholzer) (2009) (pending approval)
"Ace Sleuth Sherlock Holmes" -> "A hoot screeches skull helm." (by Jim Banholzer) (2009) (pending approval)
"Sir Arthur Conan Doyle's Sherlock Holmes" -> "Hired sleuth shall corner so many crooks." (by Mike Mesterton-Gibbons by hand) (2013) (pending approval)
"The private detective Sherlock Holmes" -> "The top crime solver tackled thieves, eh?" (by Rick Rothstein using Anagram Genius) (2005)
"Sherlock Holmes, detective" -> "Clever. Old-time. Shocks thee!" (by Stanley Accrington by hand) (2008) (pending approval)
"Mister Arthur Conan Doyle" -> "I read Holmes, corny truant." (by Stanley Accrington by hand) (2004)