Offshore Banking is a quite hot topic now a days over the globe as it has lots of advantages while a slight chance of fraud or financial loss. 
This actually begins by the famous Offshore Banking Scam of Grenada. Four persons has been arrested that has cost millions of dolloar loss for US and Canadian Investors. The names of these four persons are reported to be Douglas Ferguson, Laurent Barnabe, Robert Skirving and Rita Regale. They however claimed to be nearly pennyless themselves.
As of its own nature, this investigations was spread out to be on three continents and took a time frame of 8 years to finish. This is a huge investigation by its very nature.