Is it okay to let on that I looked up a colleague online if it's to ask about a book I then discovered that they wrote?

Is there a diplomatic/discrete way of asking a colleague about a book that I found out that she wrote as a result of Google searching her? The book is non-fiction and work related, but maybe I would be showing too much interest by letting on that I researched her?

Is it okay to let on that I looked up a colleague online if it's to ask about a book I then discovered that they wrote?
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