Fifteen-year-old Smiler is still on the run.

Smiler is aiming to evade the police until his father, a ship’s cook, comes home to clear him of a crime he hasn't committed. Hitching a train to Scotland, he finds work as an animal caretaker within the grounds of a castle occupied by ‘the Laird’, Sir Alec Elphinstone.

When the Laird leaves on a trip to London, Smiler discovers that thieves are planning to invade his employer's castle.

Dare he go to the police for help?