This is the prelude to "The Lord of the Rings". Bilbo Baggins is a hobbit who enjoys a comfortable, unambitious life. But his contentment is disturbed when the wizard, Gandalf, and a company of dwarves arrive on his doorstep to take him on an adventure.
Sabriel is sent as a child across the Wall to the safety of a school in Ancelstierre. Away from magic, away from the Dead. After receiving a cryptic message from her father, 18-year-old Sabriel leaves her ordinary school and returns across the Wall into the Old Kingdom.