Basically use this google dork for searching your book

-inurl:htm -inurl:html intitle:"index of" +("/ebooks"|"/book" +(chm|pdf|zip) +"BookName"

Replace BookName with the title of the ebook, you'll find FTP servers hosting said file, should get a hit in the first site or two.

EXAMPLE:
-inurl:htm -inurl:html intitle:"index of" +("/ebooks"|"/book" +(chm|pdf|zip) +" *Travel stories* "

You get any format or file by changing "epub" to mobi, pdf, and all other extensions that available for book, See below, replace the * epub * with the file extension you desire to search with.

-inurl:htm -inurl:html intitle:"index of" +("/ebooks"|"/book" +(chm|pdf|zip| *epub* ) +"travel stories"

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