Mateo Askaripour talks about his debut novel, "Black Buck." The book focuses on a young Black man named Darren Vender. He quits his Starbucks job to join New York City's hottest tech startup, Sumwun. Darren is the only Black person in the company and after a grueling first week of training, he reinvents himself as "Buck," a tough-as-nails salesman.