Two decades of unscrupulous deals made Isabel dos Santos Africa’s wealthiest woman and left oil- and diamond-rich Angola one of the poorest countries on Earth.

A web of more than 400 companies and subsidiaries in 41 countries are linked to Isabel dos Santos or her husband, Sindika Dokolo, including 94 in secrecy jurisdictions like Malta, Mauritius and Hong Kong.

Hundreds of millions of dollars in loans and contracts were directed to dos Santos' companies.

A cadre of Western business advisers moved money, set up companies, audited accounts, suggested ways to avoid taxes and turned a blind eye to red flags that experts say should have raised serious concern.