The Last Polar Bears by Harry Horse (Viking, £9.99)

Grandfather and his trusty dog, Roo, set out for the North Pole on the good ship Unsinkable to find polar bears. Their journey to Walrus Bay is an adventurous one and things don't get any smoother once they set foot in the Arctic Circle, especially with the penguins causing so much mischief. Penguins in the North Pole! The author, a former political cartoonist for Scotland On Scotland, readily admits to mixing up his Poles, but don't let this put you off.