Orinthia and Seafra Shalloo accept a summer job from the eccentric Grandy Brock who has collected a menagerie of furry and feathered posties known as ANIMAILS. The children are especially fond of Geronimo a homing pelican. But when the big bird fails to return from a delivery their little brother Taber is devastated; so much so that he mails himself to New York where Geronimo was sent. Orinthia and Seafra follow suit stealing a precious stamp and hopping in a freight crate - and soon all are embarked on an extraordinarily daring first-class adventure . . .