Emma's family is moving - again. Lonely, and angry, (she's just quarreled with her best friend) she visits an old mansion awaiting a shift to an historic village site. There, she wishes for a new friend. As if in answer to her wish a girl appears. Abigail Porterhouse-Bentley who thinks she's still in 1846 and believes Emma's the witch who brought her to the present day. As lonely and contriving as Emma, she's Emma's match. Emma wants to keep her there, Abigail wants to go home. . . .

At first, Emma calls the shots, then in a surprise move, time reverses and it's Emma's turn to be in a strange place and time - and Abigail exacts her revenge!