Jimmy Trewin and his little sister are devastated by their mother's death and horrified to find themselves entrusted to the far from tender 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 and when Cyril Huxtable is seen by the children hiding "a wad of notes" away, a wad which subsequently disappears, they realise they are in deep trouble. Cyril accuses them of theft and threatens a terrible revenge so 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 ...