- Love . . . too late?
- Michael: He's being held in a secret compound. But he's concerned less for himself than his friends. Max. Maria. Liz. Alex. And Isabel. He's got to get out before he's forced to betray the Roswell residents whom Sheriff Valenti is dying to capture. And once Sheriff Valenti has the information he wants, he won't be needing Michael anymore.
- Isabel: She used to think of Michael as a brother. But now that he's been captured, she seems to be the only one able to hear his every thought, feel his every emotion, share his dreams. Could this special bond between them mean they're meant to be together? Time is running out for Isabel to know for sure . . .
- Stacey Scheinin, head cheerleader
- Tish Okabe, cheerleader and Isabel's friend
- Corrine, cheerleader
- Lucinda Baker, cheerleader, she works at Flying Pepperoni
- Sheriff Valenti
- Ray Iburg
- Elsevan DuPris
- Adam (debut)
- Dr. Brian Doyle (debut)
- Bill (debut)
- Cameron Winger (debut)
- Eaton (debut), a guard
- Nikolas Branson
- Sean Wentworth (first mention), a boy Cameron had a crush on when she was twelve
- Raina (first mention), a girl Max had a crush on freshman year
|Paperback||Simon Pulse||Apr 1, 1999||0-671-02378-0|
|Paperback||Simon Spotlight Entertainment||Mar 1, 2000||0-671-77459-X|
|Library Binding||Turtleback Books||Mar 1, 2000||0-613-73179-4|
|Paperback||Simon & Schuster Children's||Jul 1, 2000||0-7434-0882-9|
|ebook||Gallery Books||Nov 17, 2001||0-7434-3446-3|
|Audiobook||Tantor Audio||Apr 30, 2019||978-1-5159-4343-3|
International releases: Dutch paperback - De indringer - 9789044928815 
- This is the last book in the Roswell High series not to have its first edition cover be based on the actors of the Roswell television series.