Drop in Infinity

This 1915 sci-fi book is possibly the first work to use in its plot what we would now call a parallel universe. Jack Thorpe and Marjorie Matthews are walking along the beach in Cornwall when they run into an odd man. Their interactions with him begin their adventure. Will they ever return from the parallel world they call Marjorie-land, into which they are swept? This story, told by one of their descendants, will reveal the answer. - Summary by Verla Viera