Chaos Theory by Graham Masterton

A new thriller from the master of suspense - When stuntman Noah Flynn finds a strange medallion with what appear to be ancient cuneiform markings, little does he suspect there will be disastrous consequences for those around him. When the Arabic would-be assassin of aid agency diplomat Adeola Davis turns out to have been wearing a similar medallion, she and Noah join together to discover what this can all mean, as the death toll continues to rise . . .