Sonja Kurtz - former soldier, supposedly retired mercenary - is in Vietnam carrying out a personal revenge mission when her daughter sends a call for help.
Emma is on a dig at the edge of Namibia's Etosha National Park studying archaeology and she's discovered a body that dates back to the country's liberation war of the 1980s.
The remains, identified as Hudson Brand, are a key piece of a puzzle that will reveal the location of a modern-day buried treasure. A find people will kill for.
Sonja returns to the country of her birth to find Emma, but she's missing.