When Stoick discovers that Berk's only water well has run dry, Hiccup decides to investigate. With Toothless by his side, Hiccup goes deep underground and soon discovers a problem far worse than he could have ever imagined.
| Publisher | Igloo Books |
| Year of publication | 2016 |
| Number of pages | 24 |
| Language | English |
| Format | Hardback |
| ISBN-10 | 1785570633 |
| ISBN-13 | 9781785570636 |
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