A mystery story about a ghost trapped in a house which slips in and out of different periods in history. The ghost appeals to the boy who lives in the house for his help to release her spirit from the house.Exciting mystery/ghost story which keeps the reader gripped.Margaret McAllister's third novel for OUP - her first two books A Friend for Rachel and Hold My Hand and Run were very well reviewed.Unusual angle on time slip - it's the house that time-travels.Margaret McAllister lives in North Yorkshire.