The Bourne objective

In Jason Bourne's fragmented memory lies the image of a young woman's murder. Before she died, she entrusted him with a ring - a powerful artefact that some would kill for ... Now Bourne is determined to find the ring's owner and discover its true purpose. Bourne's trail leads him through layers of conspiracy to Russian mercenary Arkadin - a graduate of the same CIA covert training programme as him: both men have equal skills, equal cunning and equal force. -- back cover.