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One day, Ida receives a strange letter smeared with green slime. Who sent this message? Murphy the polar bear gets to the bottom of the case. The child will not even notice how they will reach the last page, wanting to solve the mystery of the strange letter. The crossword puzzle at the end of the book will show how carefully the child read the text (and how good a detective he or she is!). And to make reading even easier and more interesting, difficult words in the text have coloured syllables.