Jimmy Trewin and his little sister are devastated by their mother's death and horrified to find themselves entrusted to the care of a hated neighbour, Mrs Huxtable. They hope their father will rescue them when his ship comes into port but this does not happen. When Cyril Huxtable accuses them of theft and threatens a terrible revenge, they decide to leave Liverpool and try to find their mother's family in Wales. Soon, they meet Miss Trent, a school teacher who has been unfairly dismissed, and agree to join forces since Miss Trent also hopes to find relatives in Wales. But Cyril has promised to pursue them until they hand over his property, and soon they realise he has picked up their trail...
