We spend 15 Seconds In the Stacks with The World Beneath by Rebecca Cantrell. Purchase the book on Bookshop here, and on Amazon here.

"When software creator Joe Tesla becomes agoraphobic, he moves underground Grand Central Station. Like his famous ancestor, Joe’s inventions solve puzzles, not only the mysteries in the train tunnels, but also the ones in his head." -- Michelle Z. from In the Stacks.tv