Lucy and her friend Evie look out of the window one day and see a small, fluffy snowman - in the middle of summer! On closer inspection, they realise it's a baby penguin This seems to confirm the eco-minded girls' worst fears about global warming - the ice-caps have melted and the penguins are being forced into new lands! They look after Pablo until they discover he's been penguin-napped from the local zoo But when Lucy and Evie take him back there, they discover that something sinister is happening at the zoo and are determined to investigate