Neville pointed to reviews on the Amazon website in which he claimed Millar used fake identities to laud his own books and put down other writers.

BBC: NI crime writers Stuart Neville and Sam Millar clash

After a while, some of these dummy invoices were simply left on the books and occasionally, according to Reiman, fake orders were created for customers who didn't exist.

FORBES: Can You Believe Those Revenues?