Bestselling author Freida McFadden has revealed her true identity as Sara Cohen, a physician specializing in brain disorders in the USA.Cohen maintained a secret double life for twenty-three years by wearing wigs and glasses to separate her medical and literary careers.The announcement follows the major success of a film based on The Housemaid which grossed 400 million dollars in global theaters.McFadden plans to continue her writing career while maintaining a part-time medical role despite the public disclosure of her name.