This is a translated biography of the Zen monk, Tōsui. Tōsui was considered a colorful character in his day (17th century Japan.) He lived as vagabond and beggar, and was famously anti-sectarian.
This translation takes the scholarly approach. As such, it has the advantages of being well-cited, well-annotated, and it has appendices with other writings about Tōsui, but it doesn't necessarily capture the zany and the quirky personality attributed to the monk. It's a bit of a dry read if you're expecting an entertaining tale of a "crazy sage." This probably has to do with the source material, which was also written in the seventeenth century, and which probably reflects different interests than a present-day reader would have.
If you're interested in Tōsui, this may be the only English language book on his life. He isn't as extensively written about as some others. That said, this book didn't grab me, though it did present some interesting information.