This is a classic science fiction adventure novel by Marion Zimmer Bradley.

SUDDEN PANIC

The needle went into his arm. In sudden panic, he realized he was helpless. The ship would touch down on three worlds, and on any of them the Lhari might have his description, or his alias! He could be taken off, unconscious, and might never wake up! He tried to move, to protest, but he couldn't. There was a freezing moment of intense cold and then nothing....

Rick Brant and his pal, Scotty, have the kind of adventures all boys would like to have. They live on an island called Spindrift where Rick's father heads a group of scientists working in the field of electronics. Here and abroad, the boys encounter many thrilling adventures and solve many baffling mysteries. This e-book is one out of the Rick Brant Science Mystery series of e-books.

Rick Brant and his pal, Scotty, have the kind of adventures all boys would like to have. They live on an island called Spindrift where Rick's father heads a group of scientists working in the field of electronics. In the U.S. and abroad, the boys encounter many thrilling adventures and solve many baffling mysteries. This e-book is part of the Rick Brant Science Mystery series of e-books.

Go through a mystical doorway to see what's on the other side of a mirror.

Full ebook by Lewis Carroll. It is the sequel to "Alice's Adventures in Wonderland". Exactly 6 months after falling into the rabbit hole, Alice steps into the mirror into a different world.