IMHO, Mason's Rats is a fascinating story idea. This is a 36page booklet, of three Mason's Rats stories I, II & III. A 'Mason's Rats' story can be found in: Year's Best SF 11, David G. Hartwell & Kathryn Cramer (Editors) Jun2006 mmp 0060873418; and two Mason's Rats short stories, " Mason's Rats: Black Rat" and "Mason's Rats: Autotractor", are in: The Solaris Book of New Science Fiction: Volume Two, George Mann (Editor) Mar2008 mmp 1844165426
