Jens Stoltenberg had planned to step down after nine years in the powerful position of NATO Secretary General. The 65-year-old politician had packed his bags to go home to his wife in Norway, as he had promised her. But then Joe Biden called and asked him to stay another year. Because in a troubled world, an experienced leader is needed more than ever. With unprecedented access, we follow Jens Stoltenberg through his last year as Secretary General of NATO.