Escape with Erec Rex into a world where magic has not been forgotten, where land, sky, and sea carry dangers and wonders of long ago. Erec must survive the ultimate test to save the magical kingdom he was born to rule.

A companion volume to Thud! describes how Commander Sam Vimes of the City Watch returns home each night to read Where's My Cow? to his little boy and how, concerned about the book's relevancy to his young son, begins to adapt the book into a dark tale that will be more useful to a youngster growing up in the big city.