Upon Bowditch's death, Charlie receives a cassette tape revealing the impossible: the locked shed in the backyard contains a portal to another world. Desperate to save the dying Radar, Charlie descends into Empis to find a legendary that can restore youth. Key Themes and Influences Fairy Tale Summary | SparknotesAI
And yes, the key to the whole plot is a German Shepherd named Radar who is old, sick, and desperately needs a miracle. Fairy Tale -U.S. Edition- by Stephen King EPUB