Presented as the journal of one Neve Selcibuc, a young journalist, this serves double purpose as a piece of Mythos fiction and - more excitingly - a mammoth in-character resource that Keepers running The Curse of Nineveh campaign can had to the players as background and indeed clues.
The tale Neve has to tell is quite dramatic beginning with someone leaping off a passenger ship to their (presumed) death leaving a small but ancient artefact, and various alarms and excursions that follow as she visits an English country house then spends time in London, with deaths and a kidnapping or two and some unexplained fires. There's even a gunfight! Stirring stuff, as the Mythos disturbs 1920s Britain. It all ties in well with the content of The Curse of Nineveh, and opportunity is provided in that work's text for this volume to appear should you have it to hand, as Neve Selcibuc features as an NPC.
It's nicely-presented, and the writing has a certain gentle charm, highlighted by line drawings that complement the text. As an in-game resource, it enhances the information available in the campaign but may prove rather too much for players to want to deal with during actual play - it may be preferable for you lend it to them to read between sessions. To help you use it to best effect, there are some notes at the back with suggestions as to the role it can play in your game. The particularly interesting thing is that only the last few pages tie in to the actual plot of The Curse of Nineveh, yet there's a whole raft of other peculiar events which could be used to develop a plot of your own, to run in parallel with the main campaign or at another time as you prefer.