Heinlein is a guy who knows his cats - in terms of their behaviour, their likes, dislikes and even vocalisations. It's therefore fitting that this book's central conceit is based on a cat looking for a door into summer during wintertime.
I rather liked Davis, the engineer, an individualistic everyman with multiple talents and lots of drive.
I enjoyed the interplay of themes of slow and fast time-travel (and there's enough hints early on that will enable you to figure it out early on and feel like a genius).
As with most science fiction of this period, there's plenty Heinlein gets wrong in his forecasting - but he also gives some very credible descriptions of current household appliances.
More problematic is the central romance. The age gap and ages of the protagonists is rather large although somewhat dealt with.
Verdict: Not quite top notch Heinlein, but still very enjoyable.
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