Section 18
Effect of fraud
When any person having a right to institute a suit has, by means of fraud, been kept from the knowledge of such right or of the title on which it is founded, or where any document necessary to establish such right has been fraudulently concealed from him, the time limited for instituting a suit⎯
(a)
against the person guilty of the fraud or accessory thereto; or
(b)
against any person claiming through him otherwise than in good faith and for a valuable consideration, shall be computed from the time when the fraud first became known to the person injuriously affected thereby or, in the case of the concealed document, when he first had the means of producing it or compelling its production.
Effect of acknowledgment in writing