No one wants to believe that Jessica found a body in her hotel suite in London and they don't want her to believe it, either. The body is Nigel Atkins from the Home Office, someone she was introduced to earlier in passing. His body goes missing - the police think she's making it up, and the Police inspector later assures her that he's spoken to Atkins who is still quite alive and now on his way out of the country. It doesn't take her very long to figure out that she's in the of some type of intelligence operation.
Quite an enjoyable episode with Jessica looking suitably stressed over seeing a dead body has gone missing and that person has a different name to what she was told. There's enough twists to keep your attention. It's amazing how quaint London is portrayed as.