The little dragon Coconut is terrified: the old Murk has kidnapped his friend Oscar! Both have disappeared from Dragon Island. Fortunately, Oscar managed to leave a letter with important information. And this first letter leads Coconut straight to London! But just as he arrives there, the big chase begins: first in Paris, then in China, and later in the land of the Indians. Oscar's letters always provide correct information. But each time they reach Coconut a little late. Will the little dragon be able to free his friend? A book outside the main series, which includes envelopes with letters that the young reader can unfold and read.