Turtles All the Way Down (novel)

I'd read most of John Green's books except for "Let It Snow: Three Holiday Romances", and for "Will Grayson, Will Grayson."

I forgot on how I learned about his new novel "Turtles All the Way Down." I couldn't find a book trailer of the book on YouTube, but here's a video about the book the vlogbrothers' YouTube channel.