The possibility raises a chilling question about what Billie might know and whether anyone realised she could possess information powerful enough to unravel the official version of events. If the recovery of Poseidon was authorised through channels the public was never meant to discover, even a fragment of proof could expose who gave the orders, who carried them out and who helped bury the truth.

For Kate, the stakes could become even more personal. Her decision to walk away from the G7 already carried enormous political implications, but the discovery of evidence linking the operation to influential figures could force her into an impossible position. Revealing the truth might bring accountability — yet it could also threaten alliances, careers and the fragile balance of international power.

And if Billie really does hold the missing piece of the puzzle, the most dangerous question is no longer what happened to Poseidon. It is who would do anything to ensure that nobody ever finds out. For now, this remains a tantalising possibility rather than a confirmed plot development, but it could open the door to one of The Diplomat’s most explosive twists yet.