Do you believe in angels? Bert and Betty Brown do, because Bert discovered one in his shirt pocket the other day while he was driving his bus. All of a sudden they had a little boy of their very own to care for -- how heavenly Bert and Betty's friends think Angelino is lovely. So do Nancy and Jack and Alice from school. But the Head Teacher, Mrs. Mole, is not so sure. Neither is Professor Smellie. And who is the mysterious Man in Black who claims to be a School Inspector? Or the big, lumbering Basher Malone? What could all these sneaky adults possibly have against such a perfect little angel?