XYZ Publishing House is continuing in publishing books written by Vojtech Steklac and ilustrated by me. They are coming with new book Hellclass & Golden Credit Card after the last reedition of Borik in Troubles Book this year. Borik, Mirek, Cenda and Ales are not pupil but students of the private high school. Owner of this scholl, unpredictable millionaire Pokstefl, gives them unexpected gift for the summer holiday – golden credit card with 50 millions. He sets them task to invest money and be in profit and boys found detective office to be successful. The world of crime has new enemies in boys and their new friend Hugo – reformed delinquent.