The fourth book in the series takes the children back to the Lake District to convalesce from the mumps during the winter. Despite these inauspicious circumstances they manage to have an exciting adventure to the 'North Pole'.
ReproJacket #136-F-1, size 205.8x507mm.
This version is the 2nd printing of the reset edition.
Comparing the artwork on this jacket with the 1939 version, it has been reduced in scale a little in line with the reduced board size; its vertical margins have also been trimmed slightly.
ReproJacket #134-B-1, size 201.2x464mm.