For the uninitiated, this 147-page novel chronicles the first meeting and adventures of Boinger the Hobbit and Zereth the Elf, who had earlier appeared in the three short stories in Dragon magazine. The story grew out of Holmes' actual OD&D games with his sons.
For a great review of The Maze of Peril, see this 2011 post on Delta's D&D Hotspot.
See also my 2006 overview pointing out similarities to Holmes' Sample Dungeon.
See also this earlier post with links to more reviews, and info if you want to try to mail order it directly from the publisher.
I have a copy on order to give away in December, in my annual "Holmes for the Holidays". Stay tuned!