The Door into Summer(1957)Daniel Boone Davis was an electronics engineer. Not just any old electronic engineer, but one with a talent for creating innovative products. He designed and marketed several very innovative products. Unfortunately his business partner and fiance duped him out of control of the business and gave him the boot. D. B. Davis wasn't going to take this laying down.If it took cryogenic sleep and time travel to get his revenge, well so be it.Oh, and THEN there was Ricky.I highly recommend this to fans of Heinlein, time travel enthusiast, and people who just like a good story. Quite frankly I don't know why I waited so long to read it.While this is not one of Heinlein's "official juveniles", I believe it should fall into the juvenile category.Gunner November, 2012