The Replica Series books 1-5 by Marilyn Kaye is a vintage Y2K science fiction novel aimed at young adult readers aged 9-12. Published by Bantam Books in 1998, the series follows the adventures of a replica named Nikki as she explores the world of science fiction. The paperback books are part of a series and are written in English, making them an engaging read for fans of the genre. With a nostalgic feel and captivating storyline, these books are sure to captivate young readers and transport them to a world of imagination and adventure.