Faithful Enemy

There are eight friends. All of them united in childhood. The next thing they know, they have completed their studies and embark on a mission which they haven't even thought of in their dreams. They face the gravest challenges of their life. A friend isn't with them, another friend dies and yet another friend disappears. A helicopter, a shark, a ship, two planes, a lion and a bird, all explode. They are at the end of their wits.
And yet another time, they find something which lead them into one of the most dangerous place which they had just read of in books. It is a game of life and death. Will they achieve their goal? Will they be successful? Will they come out of that place alive? Who wins?
The mystery unfolds.