"Breath on the Mirror" is a conglomeration of various myths of the living Maya (as the title explains). Some of the myths revolve around the Popol Vu and some around historical events since the Spanish arrived. The latter also have Christian mythology mixed in so soon the story of Adam and Eve, or the story of Evenadam, looks more like the stories of Jacob and Esau as well as the Popol Vu, as told by a Mayan day keeper.
Tedlock also takes great care to help the reader understand not just the myths but the way they are told and where, when, and by whom they are told. Although necessary and delightful, the way the context is added can create some problems. Some of the chapters are very difficult to understand, and I even found that occasionally reading them out of order, even backwards, was more effective. He leaves out significant details and seems to be writing to those who already know the myths well. For example, in one chapter he explains the significance of some of the days of the year (which coincide to the twins' actions in the underworld, another thing not well explained), but he takes several chapters later to explain the naming of the days and how they're "counted"--information which would have made previous chapters much less confusing.
A wonderful, brilliant read, but make sure you know a decent amount about the Maya before reading it.