Mystery by Moonlight

In sunshine the old deserted house is a friendly landmark, and Gail even uses a shed on its grounds as a secret haven where she can write her poems. But by moonlight the house becomes eerie and terrifying. One night as Gail walks past it, a sudden sharp sound of knocking makes her whirl around. Someone seems to be trying to catch her attention, yet there is nothing but moonlit lawns and ghostly white walls to be seen. Where did that knocking sound have come from? And the weird voices -- who...