Did King Arthur really exist? Continuing the quest to find their missing parents who are trapped in the past, Jemima and Joe Lancelot uncover the truth behind the legend when they arrive in Camelot. Together with friend Charlie and their talking Tonkinese cat Max, the young time-travellers are plunged into yet another thrilling adventure. Was the famous knight Lancelot related to the twins? Who knows? Luckily, he seems to think so and is on hand to protect them when danger threatens. Meanwhile, Max has a mystery of his own to solve. Will he finally discover why Midnight has been haunting his dreams?