True Conviction - Adrian Hell #1 (Adrian Hell Series)

I am a beginner and I am trying to import Author's name from the amazon website using

=IMPORTXML(URL,'//*[@id="byline']/span/span[1]/a[1]")"). 

It shows parse error. Please help me fix this or let me know if you know some other way.

I am trying for below mentioned link: https://www.amazon.com/True-Conviction-Adrian-Hell-ebook/dp/B00IC46HYO/ref=zg_bs_157055011_f_4?_encoding=UTF8&psc=1&refRID=83TW112AQC8CND0RPX86