What 2024 CodeOrg clue had you stumped?

This was the only one I couldn't solve: Maria Konnikova posted an enigmatic message to X. Speaking in Russian, she said “I have a book in my hands and my hands in a book 236 3 12, and it will be 60 then. What is 245 23 13?” Early on, I landed on book-code and called up my friend Barry Carter to grab his copy of ‘The Biggest Bluff’ off the shelf. Unfortunately, like me, he had read it on Kindle so there were no pages as such. I tried to look it up online and found that there were multiple paperback version lengths listed and mistakenly rejected the possibility that a clue could lead to potentially contradictory information. Fortunately, brute force helped me win in the end!