Robin Masters is a fictional character from the television series Magnum, P.I., which aired from 1980 to 1988. He is portrayed as a wealthy and reclusive author who owns a luxurious estate in Hawaii. Although he never appears on screen, his presence is felt throughout the series as he employs the main character, Thomas Magnum, to manage his property and investigate various cases. Masters is known for his adventurous lifestyle and his successful career as a novelist, often writing thrillers. His character adds an air of mystery to the show, as Magnum frequently communicates with him through phone calls and letters, revealing insights into both their personalities and the dynamics of their relationship.