Double Star
Heinlein’s 1956 Hugo Award winner is a Prince and the Pauper style tale set in a future where humans have colonized the Solar System alongside native Martians and Venusians.
The Great Lorenzo is a down-at-heel actor who is shanghaied into a role of a lifetime – impersonating a prominent politician in order to prevent chaos on Mars.
The lead character is pure Heinlein – the confident competent man. In this particular case he’s only competent at acting and an idiot about everything else.
There are some rather dodgy sexual and racial politics that stand out in modern context but generally it’s much less objectionable than some of his later works.
The political intrigues and engaging storytelling pull you in but it is a very dated book. Well worth a read if you want to get to know the history of Science Fiction or are just looking for a quick and involving read.