Books in the The Hounds of Penhallow Hall series

As soon as she moves to Penhallow Place, Polly can't wait to unravel its mysteries. One night, she sleepwalks outside and wakes to find her hand on the stone statue of a dog. The dog introduces himself as Rex, an Irish Wolfhound, who lived at Penhallow many hundreds of years earlier. And he is not the only resident ghost...