As part of the Indiebound programme, Nielsen BookScan has generously agreed to supply a weekly independent Top 20 bestsellers report.

1 Richie McCaw 148
by Richie McCaw
Upstart Press  $69.99
9781927262788
2 The 78-Storey Treehouse
by Andy Griffiths & Terry Denton
Pan Macmillan  $17.99
9781743535004
3 The Kiwi Pair
by Eric Murray & Hamish Bond Penguin Books  $40.00
9780143574361
4 Harry Potter and the Cursed Child 
by J. K. Rowling, Jack Thorne & John Tiffany
Hachette $49.99
9780751565355
5 How it Works: The Dad: Ladybirds for Grown-Ups Jason Hazeley & Joel Morris Michael Joseph  $21.00
9780718184261
6 Nutshell
by Ian McEwan
Jonathan Cape $38.00
9781911214335
7 Things That Matter: Stories of Life & Death from an Intensive Care Specialist
Dr David Galler
Allen & Unwin $36.99
9781877505645
8 Lecretia's Choice: A Story of Love, Death and the Law Matt Vickers
Text Publishing  $37.00
9781925355598
9 The Best Dad in the World
Patricia Chapman
Upstart Press  $19.99
9781927262740
10 Dr Libbys Womens Wellness Wisdom: What Every Woman Needs to Know
Dr. Libby Weaver
Little Green Frog Publishing  $39.95
9780473360887
11 Commonwealth
Ann Patchett
Bloomsbury Publishing $32.99
9781408880395
12 Hera Lindsay Bird
by Hera Lindsay Bird
Victoria University Press $25.00
9781776560714
13  A House Without Windows
Nadia Hashimi
HarperCollins Publishers $34.99
9780062477842
14 Can You Tolerate This?
by Ashleigh Young
Victoria University Press $30.00
9781776560769
15 The Secret Diary of Hendrik Groen, 83 Years Old
Hendrik Groen
Michael Joseph $37.00
9780718182953
16 The New Torchlight List
Jim Flynn
Awa Press $36.00
9781927249444
17 All Day at the Movies
Fiona Kidman
Vintage  $38.00
9781775538905
18 The World's Worst Children
David Walliams
HarperCollins $24.99
9780008197049
19 Te Arawa: A History of the Arawa People
by Don Stafford
Oratia Books $95.00
9780947506100
20 The Sympathizer
Viet Thanh Nguyen
Corsair $27.99
9781472151360