Ghost Host

From Author Wars - https://authorwars.com/publications/ghost-host-453519.html

Overview:

Title: Ghost Host
Author: Marilyn Singer
Year: 1991
ISBN-10: 0590445057
Publisher: Point / Scholastic
Price: $2.95
Pages: 199
Binding: Paperback
Type: Novel
Title Reference: Ghost Host
Notes:
- Third printing, in 1991, from decoding the number line (using this algorithm):
  12 11 10 9 8 7 6 5 4 3 1 2 3 4 5/9
- Note that the ISBN number changed from the 2nd printing to the third. (This appears to be because the decade changed, and they had to make a larger change to their number line format, or possibly because of the price change.) The bottom of the copyright page says "First Scholastic printing, September 1988", which leads some book sellers to think this is a 1st printing.
- The cover was unchanged across the first three printings, except for the price change.
- $3.95 in Canada.