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When a Scot Ties the Knot,
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Pananda
No, the first three book are entirely unrelated. The series fundamental plot is that "a girl gets a castle." I have not observed any character crossovers in books 1-3. HOWEVER the 2016 Do You Want to Start a Scandal (book 4) stars a minor character from Castles book 2, AND characters from the author's Spindle Cove series. I have not read book 4, so I cannot say how much Spindle Cove is entangled in that book.
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