According to book sales monitor Nielsen BookScan, hundreds of Holmes-related titles were published in 2015.

据尼尔森图书调查机构显示，2015年有数百部与福尔摩斯相关的图书出版发行。

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1Dollarscan is the American outpost of a service called Bookscan that has been running successfully in Japan since last year.

日本在去年就有了叫做“图书扫描”的服务，经营很成功，“1美元扫描”是其在美国的翻版（相关日语视频，一看就明白）。

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The resultant 2008 book, Predictably Irrational, has sold 136, 000 copies, according to Nielsen BookScan.

FORBES: Magazine Article

But if they are looking at external talent, BookScan is the only way to get numbers.

FORBES: Can Nielsen BookScan Stay Relevant In The Digital Age?

These are Bookscan numbers for books that we think are similar to the book being pitched.

FORBES: Can Nielsen BookScan Stay Relevant In The Digital Age?