Which book by Alan Bradley is the best?

which book about Flavia de Luce do you think is the best one so far?

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1	The Sweetness at the Bottom of the Pie (Flavia de Luce, #1) by Alan Bradley (Goodreads Author) 3.82 avg rating — 159,475 ratings score: 1,297, and 13 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
2	The Dead in Their Vaulted Arches (Flavia de Luce, #6) by Alan Bradley (Goodreads Author) 4.17 avg rating — 29,148 ratings score: 798, and 8 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
3	The Weed That Strings the Hangman's Bag (Flavia de Luce, #2) by Alan Bradley (Goodreads Author) 3.99 avg rating — 52,654 ratings score: 593, and 6 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
4	A Red Herring Without Mustard (Flavia de Luce, #3) by Alan Bradley (Goodreads Author) 4.05 avg rating — 41,995 ratings score: 484, and 5 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
5	Speaking from Among the Bones (Flavia de Luce, #5) by Alan Bradley (Goodreads Author) 4.15 avg rating — 36,117 ratings score: 389, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
6	I Am Half-Sick of Shadows (Flavia de Luce, #4) by Alan Bradley (Goodreads Author) 4.09 avg rating — 34,256 ratings score: 384, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
7	Thrice the Brinded Cat Hath Mew'd (Flavia de Luce, #8) by Alan Bradley (Goodreads Author) 3.98 avg rating — 20,221 ratings score: 100, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
8	As Chimney Sweepers Come to Dust (Flavia de Luce, #7) by Alan Bradley (Goodreads Author) 3.95 avg rating — 25,692 ratings score: 99, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars