Find Private Detective Agency in Kolkata For Marriage Investigation, any assistance in divorce or matrimonial matters or investigation. Detective Eye is doing matrimonial investigation work for the last 25 years with a very high success rate. This dimension of our services is more focused on our social commitment than on core business interests. Like everyone else, we’d like to believe that marriages are made in heaven, but as professional investigators, we would recommend a thorough investigation to make sure that marriages stay that way.