Bloodline by Sidney Sheldon

Roffe and Sons is a family firm, an international empire filled with desperate, cash-hungry family members. At its head was one of the wealthiest men in the world, a man who has just died in a mysterious accident and left his only daughter, Elizabeth, in control of the company. Now as this intelligent, tough, and beautiful young woman dares to save -- not sell -- Roffe and Sons, she will have to outwit those who secretly want her power, and the unknown assassin who wants her life.