Trixie Riddle and the Mystery of Mayfield Manor

There's a mystery to uncover at Mayfield Manor, and who better to figure it out than Trixie Riddle? But after Trixie and her brother, Will, explore Great-Aunt Audrey's private suite, they have more questions than answers. Questions like: why is there a secret locked door? And how do things keep going missing right under their noses? This is the first book of the Trixie Riddle series, but each book stands alone as a separate story too.