Time Travel discussion

The House of the Last Man on Earth By Robert B. Marcus Jr. & Ryan Marcus.

Convinced that his bizarre neighbor might be a part of a hostile alien agenda, college student Richard Johnson, along with his set theory teacher and her brother, embark upon a soaring and treacherous journey through space and time to discover a terrible truth — mankind is being slowly and systematically exterminated.

For multiple chances of winning a copy...you can enter the broader Goodreads giveaway here: https://www.goodreads.com/giveaway/en...

Alternatively you can get a chance to win a signed paperback copy by playing NAME THAT BOOK! The author Robert B. Marcus Jr. will be posting clues below. Be sure to use spoiler tags to conceal your answers, so others can participate.

First clue: Older time travel book with a number of time travel twists (the first clue is not supposed to be easy).

Robert B Marcus Jr

New clue for House of the Last Man on Earth Giveaway. NAME THAT BOOK.

Protagonist is an inventor.

(view spoiler)[The Time Machine? (hide spoiler)]

No, but keep trying. It is newer than that.

Another clue:

The hero uses "Cold Sleep" to go forward in time (twice) but finds a time machine to go backwards.

Another clue for the giveaway:

One reason the hero has to go back in time after using the "Cold Sleep" to go 30 years forward is to find his pet cat Petronius.

Is it (view spoiler)[ The Door into Summer, by Robert Heinlein (hide spoiler)]?

Yes it is. Was going to hold off the cat clue until later but went ahead and gave it earlier than I planned. Send me your address to rbmarcusjr@yahoo.com and I'll send you a copy of our book. Congratulations!

congrats Nathan

Just a note to emphasize that the giveaway is still going on since I planned to giveaway two copies of our book. But this is on the honor system--do not view Nathan's answer. But IF you haven't and want to enter the giveaway, please feel free to post an answer.

(view spoiler)[ The door into summer <\spoiler> (hide spoiler)]

You're right of course. Congratulations. If you would like a free copy of our book, send me your address to rbmarcusjr@yahoo.com

Since two people have guessed the name of the book, which is The Door Into Summer by Robert Heinlein, the giveaway is now over. Congratulations to Nathan and Max.

However, the general giveaway through Goodreads is open until midnight tonight if you want to give that one a try.

Thank you Robert for giving away your book! Also, thanks for those who participated and won the game. Please, take the time to read the book and leave a review. We would like to promote our authors!