Beethoven part en vacances, avec Sara et son oncle Freddie, dans un ancien village de mineurs. Toujours aussi malicieux, Beethoven va déterrer un ancien billet de 10 dollars... Aussi, quand les villageois découvrent que ce billet est l'ultime indice pour retrouver une véritable fortune cachée, ils veulent tous devenir le meilleur ami de Beethoven... When Sara takes Beethoven to spend summer vacation with wacky Uncle Freddie in an old mining town, the mischievous canine "digs up" the missing clue to a legendary hidden fortune of Rita and Moe Selig. Now everybody wants to be the dog's best friend as his discovery unleashes a frenzy of treasure hunting among the community's cast of kooky creatures. With help from Uncle Freddie and Garrett (a friend or maybe more), Sara and Beethoven try to help uncover a secret that has been in the crazy little town for years. Description above from the Wikipedia article Beethoven's 5th (film), licensed under CC-BY-SA, full list of contributors on Wikipedia.