In a small town called the Green Forest, there was a charming glass-walled library full of fairy tales, poems and stories. For little five-year-old Swift, this place was like a second home. He squatted on a comfortable purple armchair in the corner, opened a book and began to read. One day, however, when Swift came to the library as usual, he noticed that his favourite book - 'Little Cloud's Wanderings' - was missing from the shelf. He looked everywhere for it, but to no avail. Desperate, he went to the librarian, Mrs Malwina, who always had a kind smile on her face. 'Ms Malwina, have you seen my favourite book? - he asked in a sad voice. The librarian was surprised. The book seemed to have disappeared without a trace. 'Don't worry Swift,' - she said - 'I'll help you find it. Thus began the extraordinary adventure of Swift and Mrs Malwina. Will they manage to find the missing book? Or is this just the beginning of an even bigger mystery waiting for them in the Green Forest library? The adventure is just beginning and the excitement is running high.