Cabot Cain is an agent for Interpol.
To be more accurate, he is a freelance operative who works almost exclusively for Interpol, Department B7, handling tasks that most others would walk quickly away from. These assignments are usually presented to him by his close friend and former associate, Colonel Fenrek. It is Fenrek that Cain uses to help provide needed background information to discern the good guys from the bad. It is Fenrek that sometimes has to prod Cain into taking an assignment if it doesn't sound interesting enough at the outset.
Cain is a big man. A really big man. He stands 6'7 and weighs in the neighborhood of 240 lbs. He remains in excellent physical shape due to an almost fanatical exercise regimen which includes, when time permits, jogging 5-10 miles at a time. As further proof of his dedication to conditioning, at one point while awaiting the pleasure of a beautiful woman in his hotel room, Cain spent the time doing 450 pushups!
Cain doesn't need the job as he is independently wealthy as well as quite educated, having been a visiting professor at several universities. He once remarked that he took the time to achieve a Master's Degree in Petrology just for fun. He is also an expert with flowers and loves them enough to take the time to actually look at them, even if he tends to critique their soil or their nutrients or such.
Though he doesn't need the work, Cain does need the excitement that his job brings him and the challenge of going up against bad people and winning. Despite the way that this makes Cain sound, however, he is not a narcissist nor an egotist. He knows well that his large size makes him an obvious target and he wants to ensure that he has the ability to get out of trouble.