The tenth mistake of Hank Hooperman
(Book)

When eleven-year-old Hank's mother does not come home after a week, he and his toddler sister, Boo, seek out the stranger listed as their emergency contact, even though it means social workers, a new school, and having to answer questions about his mom that he has been trying to keep secret.

Ages 8-12 Alfred A. Knopf

Grades 4-6 Alfred A. Knopf