From the back cover:
Why do the Dove children run away? Because their parents are dead and life with Uncle Toby is a series of unbearable cruelties and humilations. Because they have a grandmother who loves them, somewhere across the Irish Sea.
Finn, twelve, vaguely remembers going to visit Granny O'Flaherty as a little boy. Derval, seven, trusts her borther, having no one else to love or trust. And so, one April evening, they set out with no money and only Finn's hazy recollections to guide them.
This is the story of that flight, an adventure carried out with determination fraught with suspense, tinged with panic after the children discovered that Uncle Toby had put the police on their trail
"Walter Macken had the wonderful storytelling gift of the Irish. Never did he spin a more engrossing or affecting tale." Book World