在幼儿园，发生了一起奇怪的案件，有人偷了小男孩尤拉的便盆。什么人会偷尤拉的便盆？为什么要偷尤拉的便盆？小侦探尤莉亚决定去探求真相，帮尤拉找回便盆。在寻找便盆的过程中，尤莉亚知道了许多关于便盆的有趣史实，同时，在幼儿园的阁楼上、园长办公室里，尤莉亚发现了许多好玩的、神秘的东西，但就是没有找到尤拉的便盆，直到尤莉亚查到幼儿园里的温室……一个惊人的大秘密即将被尤莉亚揭开！
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