15.  The Minister may at any time direct the Controller or any inspector to make an investigation, under conditions of secrecy, of the books, accounts and transactions of a licensed housing developer, if he has reason to believe that a licensed housing developer is carrying on its business in a manner detrimental to the purchasers or other persons dealing with the licensed housing developer or has insufficient assets to cover its liabilities or is contravening any of the provisions of this Act or any regulations made thereunder.