The key-card log is only twelve lines long, but it might as well be Anna Kepner’s death certificate.

22:14 – Anna Kepner enters cabin 2239
22:17 – T.H. enters cabin 2239
02:51 – T.H. exits cabin 2239 (17 minutes)
03:09 – T.H. re-enters cabin 2239
No further entries until housekeeping at 11:05

That 3:09 a.m. re-entry lines up perfectly with the boyfriend’s FaceTime timestamp. It also lines up with the medical examiner’s estimated time of death: between 3:00 and 4:00 a.m.

When Carnival Horizon docked in Miami on November 8, federal agents were waiting. They took T.H. off the ship in a wheelchair because he had stopped speaking entirely. He was admitted to a secure adolescent psych ward the same day. Doctors say he hasn’t said a word since.

The homicide ruling came down on November 24 like a guillotine. Mechanical asphyxia. Bruising consistent with an arm-bar choke hold. No drugs, no alcohol, no signs of a struggle, because Anna never woke up.

Prosecutors are in a race against the calendar. In Florida, a 16-year-old can be charged as an adult for murder, but only if the state attorney files the motion within 21 days of arrest. There has been no arrest yet. The FBI is being deliberately slow, building a case so airtight that even the best defense attorney in Miami can’t poke a hole in it.

Meanwhile, Anna’s ashes sit in an urn shaped like a dolphin because that was her favorite animal. Her cheer squad released blue balloons at the 50-yard line of their last home game. Her Navy recruiter still calls the house every week, not knowing what else to say.

And somewhere in a locked ward, a 16-year-old boy who once posted Bible verses on his Instagram stares at the ceiling, carrying the only key that still works: the truth of what happened in cabin 2239 when the ship’s lights went down and the ocean kept rocking them both to a sleep one of them would never wake from.