When Rocky finds a seaweed scroll that describes an abandoned pirate ship bursting with jewels, the students are tripping over their tails with excitement. There’s only one problem: the treasure is supposedly guarded by pirate ghosts! But a few “silly ghosts” aren’t going to keep prima donna Pearl away from fame, fortune, and “diamonds as big as a merman’s fist.”The hunt is on! Pearl recruits fellow merkids Rocky and Wanda to help her track down the treasure by swimming all the way past Whale Mountain. But when they discover the pirate ship, they hear eerie moans and groans coming from within. What’s making those sounds? Could the pirate ghosts be real? And can the merkids get the jewels before becoming someone’s—or something’s—lunch?


洛基發現了一個海草卷軸，上面記載著一艘載有滿滿珠寶的廢棄海盜船，人魚學生看見後興奮得被自己的尾巴絆倒。但問題是，據說這些寶藏由海盜的鬼魂所看管！但自負的珍珠絕不會因為有這些「愚笨的海盜鬼」，就放棄名利與跟拳頭一樣大的鑽石。尋寶之旅已經展開！珍珠找了洛基與汪達這兩個人魚小孩游過白鯨山，跟她一同尋找寶藏。但他們找到海盜船時，卻聽到船內不斷傳來恐怖的悲鳴及怒吼。這些聲音到底打哪來？難道海盜鬼魂真的存在？這群人魚學生能成功取得寶藏、還是會先成了別人口中的的食物呢？