B.I.O. LIMITED. v. DEGRAFT-AIDOO Detinue—Unlawful detention of documents—Capacity to sue—Prerequisites for success—Respondents given title deeds by owners in pursuance of a contract—Respondents giving title deeds to A to prepare contract documents—Respondents vested with right to immediate possession of title deeds—Whether respondents entitled to sue in detinue on failure of A to surrender title deeds on demand.