The call, according to metadata collected by the FBI, lasted just half a minute, but soon afterward Kim called Rosen and they talked for nearly a dozen minutes. After that conversation, they left the building at roughly the same time, then spoke once more on the phone after they both returned.

A classified report on North Korea had just begun circulating, and Kim was among the restricted number of officials with clearance to read it. He logged onto a secure computer, called up the report at 11:27 a.m., and phoned Rosen 10 minutes later. A few minutes past noon, he left the building again, and a minute later Rosen followed. The destruction of Kim’s life would center on the question of what the two men discussed during that brief encounter outside the State Department.