Things are about to get seriously spooky for Alex Neptune in his fourth action-packed adventure - perfect for fans of Percy Jackson and Dragon Realm! When a creepy fog rolls into Haven Bay, Alex, Zoey and Anil are ambushed by terrifying crab-riding zombies, controlled by the evil spirit of Brineblood the pirate. The only weapon that can stop Brineblood's zombie army is a powerful trident - but it's been broken into three pieces. Alex, Zoey and Anil must enter three deadly worlds that have been magically trapped in bottles to retrieve the hidden pieces, all before the zombies can catch them. But with some penguins, an octopus and a frozen dragon on their side, how can they go wrong?.