As government investigators close in, Asiaciti realises it hasn't been keeping a close watch on some of its risky clients.

In this series finale, Mario Christodoulou traverses from Swiss mountaintop chateaux to a Nigerian coup d'etat, to find out exactly what money was secretly flowing through Asiaciti's products.

Then, he takes everything he's found to the man who built up the Asiaciti empire from nothing: Graeme Briggs.

The ABC reached out to every person named in this story, we received no response from Du Shuanghua.