Alva and Irva 
Subtitle: The Twins Who Saved a City
Publisher: Random House of Canada, Limited
Published: 2004
Format: Paperback
Number of pages: 224
ISBN-13: 9780679312345
Subjects: Fiction; Fiction - General
First sentence: The Central Post Office of Entralla can be found at 8-10 Napoleon Street, Hours Monday to Friday 9am-5pm, Saturday 10am-12pm, closed Sundays.