[1] Fog Magic tells the story of a young girl who, on foggy days, travels back in time to enter the past life of an abandoned village.

In fair weather, ruined buildings are all Greta sees, but when the fog rolls in she can travel back in time to visit the village and its inhabitants.

The coexistence of fantasy and reality... is seen most clearly..."[3] Sauer stated plainly that she values both realism and imagination in an article she wrote for the American Library Association called "Making the World Safe for the Janey Larkins".

"[4] Fog Magic is also a coming-of-age story detailing Greta's realization that she is growing up and will no longer be able to visit her friends in the town.

As children's literature expert May Hill Arbuthnot said of the ending of Fog Magic, "Maturity lies ahead and reality must be accepted".