Prince Dakkar and his mentor Count Oginski discover a plot by arch-enemy Cryptos to kill Napoleon. Arriving on their revolutionary submersible to intercept Cryptos, they glimpse a terrifying monster that seems to escape back into the bowels of the Earth. It leads them to discover an amazing underground world, and a plan more nefarious than they could ever have believed - even from Cryptos.
| Author | Jon Mathew |
| Publisher | Bloomsbury Publishing |
| Year of publication | 2014 |
| Number of pages | 263 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 1408826321 |
| ISBN-13 | 9781408826324 |
| Illustrator | Justin Goby |
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