John and his class go on a school trip to the Tower of London. While he is there he loses his pet mouse and vows to return and find her later. Back in school, he is not very attentive and falls asleep during a lesson about electricity so his teacher sends him home. On the 'tube' there is a sudden flash, and John, the train and all of the passengers turn yellow. With the help of...$前半段对儿童生活的俏皮刻画比较耐看。后半段带着一点小科普，一点小想象而一点小二逼气质。果然是鲍威尔早年的作品而已。。。
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