Everyone in Kilmore Cove is hiding something. That's what Jason, Rick, and Julia realize when they first hear about Mirror House and its creator, the eccentric inventor Peter Dedalus. A close friend of Ulysses Moore, Dedalus has been missing for many years. But before he disappeared, he concealed a dangerous secret about the Doors to Time inside his extraordinary home. And it's up to Jason, Rick, and Julia to match wits with the elusive inventor and discover what it is -- before Oblivia Newton does. . . .