Have Space Suit—Will Travel

Blurb

Have Space Suit—Will Travel is a science fiction novel for young readers by Robert A. Heinlein, originally serialised in The Magazine of Fantasy & Science Fiction and published by Scribner's in hardcover in 1958. It is the last of the Heinlein juveniles.
Heinlein made use of his engineering expertise to add realistic details to the story; for a time during World War II, he was a civilian aeronautics engineer working at a laboratory where pressure suits were being developed for use at high altitudes.
The title may refer to both the expression "Have tux, will travel" and to the television show "Have Gun—Will Travel".
Have Space Suit—Will Travel was nominated for a Hugo Award in 1959. It also won the Sequoyah Children's Book award for 1961