Assassin — Chris Ryan

Darius, son of an escaped Iranian scientist, is a pupil at an exclusive Swiss school, but his father's former bosses want him back and have no regard for the boy's LIFE or his FREEDOM.
The Special Forces Cadets are sent to PROTECT Darius. When the assassins launch a DEADLY ATTACK, their only escape is into the mountains. Pursued by their enemies, can the cadets triumph and SURVIVE the deadly natural HAZARDS of the alpine winter?