Old miss Marple is on a train ride when she witnesses a murder in a passing train. She reports it to the police but they won't believe her: since no body can be found there can't have been any murder, right? As always, she begins her own investigation. The murder was committed while passing Ackenthorpe Hall and miss Marple gets herself a job there, mixing cleaning and cooking while searching the house for clues.

正在進行修業(yè)之旅的小智（松本梨香 配音）、小剛（うえだゆうじ 配音）、小遙（KAORI 配音）和小正（山田ふしぎ 配音），在前往下一個城鎮(zhèn)的路上迷失方向?？诳孰y耐的他們在荒野中偶遇巡回表演的美麗少女洋美（眞鍋かをり 配音）及其所在的瑪麗娜劇團，于是隨著她們展開愉快的旅行。洋美是水之民的后代，她們此行的目的是將曾被海盜凡頓?綽普（藤岡弘 配音）奪去的蒼海王子的蛋送回海之神殿，神殿內(nèi)則藏著水之民的珍寶海之王冠。邪惡貪婪的凡頓豈能甘心失敗，他將與洋美、小精靈護林員杰克（山寺宏一 配音）以及小智一行展開激烈的正邪爭奪戰(zhàn)……本片為神奇寶貝系列第九部電影劇場版。