Bobby Pendragon has been busy leaping from territory to territory, following his mysterious uncle Press on his mission to save the world - all worlds - from the ultimate evil: Saint Dane. Now Bobby has returned to Earth - but something isn't quite right. The year is 1937 and our 21st century hero finds himself a little out of his depth. Why is this territory called 'First Earth' when Bobby is from 'Second Earth'? Can Bobby figure out where and how Earth is being threatened in 1937 before it's too late...?