Arthur's Valentine (Arthur Adventures) Paperback – Picture Book, January 30, 1988 by Marc Brown 
 
Let Arthur be your perfect valentine! It's almost Valentine's Day, and Arthur can't crack the case on who his secret admirer is. Could it be Fern, or maybe even Sue Ellen? Or is it just Buster playing pranks? Will Arthur solve the mystery, or will he be left holding a broken heart?
 
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