General Gore's evil poison is spreading throughout the underground city of Tavnar. Jack, Danny and Ruby must descend into its dark depths before the whole population is infected. X-Men meets Beast Quest at the school for superheroes! An epic new adventure series from bestselling author Adam Blade - with amazing comic-book style illustrations. General Gore's evil poison is spreading throughout the underground city of Tavnar. Jack, Danny and Ruby must descend into its dark depths before the whole population is infected ...There are FOUR thrilling adventures to collect in this series - don't miss out! Book 1: Fight for the Hidden City, Book 2: Scorpion Strike, Book 3: Falcon of Fury, Book 4: Rise of the Shadow SnakesAnd don't forget Adam Blade's other series: Beast Quest and Sea Quest