This is Robert Heinlein's first novel. He didn't do well with it, so he put it in a drawer. It was unearthed long after his death. The book has a forward by Spider Robinson that describes how the book was unearthed. It also, although a novel in theory, explores Heinlein's political, relationship, and monetary theories rather deeply. The book begins with the protagonist waking up to discover he has left early 20th century earth, and traveled through time to late 21st century earth. As this is mainly a thinly veiled attempt at Heinlein fleshing out his socio-economic theories, it does not spend a lot of time explaining the hows and whys of time travel. It also does no apologizing for some obvious flaws. What this book DOES do is give you an understanding to where Heinlein began developing the plots he would use, in his writing, for the rest of his life. It also has an afterword that goes into more detail on his monetary theories.
This report prepared by Annette Spence