What is the main conflict in Skeleton Coast by Clive Cussler?

Skeleton Coast by Clive Cussler is an adventure that combines treasure hunting, ecological fanaticism, kidnapping, terrorism and high tech rescues. Sloane Macintyre is an employee of DeBeer's, and on a mission to recover millions of dollars worth of diamonds from the Rove - a ship that sank off the Skeleton Coast in 1896.