卡斯普是一位受人爱戴的高中历史老师，由于基因缺陷，他的视力正在逐渐恶化，面临着永久失明的可能。最初他伤心不已，为了保住自己的工作，也为了帮助他的学生们顺利通过期末考试，他对校长隐瞒了他的健康状况。CarteBlancheisastoryaboutrespectedhighschoolteacherwhohideshisprogressingblindnessfromeveryonearoundhim-hisfriends,family,studentsandsuperiors.Themedicaldiagnosisleaveslittlehope.DuetoageneticdisorderKacperisfacedwithaveryrealpossibilityofpermanentblindness.Initiallyheartbroken,hedecidestohidehishealthproblemstofulfillhiseducationaldutyandhelpstudentswithendofschoolexams.