A detect-o spy Lamp is a special light used to reveal messages written in invisible ink. Fern used one to read Persimmony Glitchet's letters that were written in invisible ink. There is a chance that the lamp is Horrendously Horrible Happenings merchandise, as Fern said that Victor Bronte used one in Book 5: The Malevolent Mailbox.
- ↑ http://tv.ark.com/transcript/arthur-%28the_squirrels%3b_fern_&_persimmony_glitchet%29/1020/KTEH/Thursday_February_18_2010/199756/
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