The second book in the magical new middle-grade series about an anxious girl who investigates legendary monsters, by the award-winning author of Lenny's Book of Everything and Dragon Skin 'Full of humour, fantasy and magical realism...the ideal story for early readers' - Better Reading 'Another brilliant instalment in this fantastic middle grade series...so much fun and very addictive, pulling in readers all the way through' - Kids' Book Review There are those who hunt monsters to harm them and there are those who hunt monsters to help them. Which one are you? Miss Mary-Kate Martin and her mother are off on an adventure to the enchanting Greek island of Galinios. An ancient mosaic has been unearthed and Professor Martin must investigate, leaving Mary-Kate to explore the island and bask in the sunshine. But soon her relaxing holiday turns into a monster-sized mystery, when a message arrives asking for help. Could the local legend of the Two-Headed Hydra be more than just a story? And what could have made this serene sea creature so angry? Miss Mary-Kate Martin might be anxious, but she's not scared of monsters! With the help of her new friend Nikos, she is determined to find answers.