WASGIJ? RETRO MYSTERY #6

A family of campers has found the perfect spot for their holiday, surrounded by nature in the heart of the idyllic countryside. Dad is so excited to be there he's already started fishing, but will he still be so keen when he reels in his catch? Dad is determined to land that fish, but will he be so thrilled when the catch of the day finally appears? What could possibly put a dampener on such a fun-filled afternoon? That is the scene you have to puzzle.