Hi I was born 3 Nov 1964. Will I be successful helping my husband get his investment money back ?

My husband born 9 feb 1956 has been involved in a very dubious investment opportunity and totally taken in by unscrupulous people. They knew he had had a stroke two years ago and probably not good at making wise decisions and now I am trying to help him get some of his money back. Will we be successful getting some of his money back ?