The City of Lizards

Minerva, Ravi, and Thomasina are certain that the gold key they found at Lizard Manor will grant them access to the legendary City of Lizards. All they need to do is find the door so that they can search for the ancient treasure of the Cornish pirates. But there's more than riches hidden there . . . will the city also shed light on the secret of Minervas mysterious past?