Possible Clues:

• Murder penalty imposed on drunkard on drug is not generally understood
• Nothing in the secret I leaked is really secret
• Coteries reassembled in secret
• Mysterious to all but a chosen few
• Incomprehensible
• As habitual drunkard, man's English at first unintelligible to outsiders
• Obscure end for the drunk man
• Obscure, abstruse
• Occult coteries broken up
• Could coteries be so highly specialised?