Timescape's plot centres around an ecological disaster in the late 1990's. Scientists and a British government official, Peterson, are working with tachyons (particles which move faster than the speed of light) in an attempt to send a morse code message to another scientist, Gordon Bernstein, who is working on a similar project in 1963.
The structure of the book is pleasing: chapters flit between past and present, emphasising Benford's move away from a Newtonian concept of time as a "flux" .
These ideas are developed further within the plot and to Benford's credit his use of physics is very clearly explained. I am not a scientist, and I found his ideas clear cut and thought provoking.
Timescape's faults lie in its length: it should have been edited by 50 pages to make it tighter. Although Benford spends ample time developing his characters they are from government or academic backgrounds. To his credit Benford places the character of Renfrew in the 1998 chapters and Bernstein in the 1963 sections. Amidst the world of the self-centered Peterson and the academic jealousy of Lakin, Renfrew and Bernstein emerge as credible heroes: the very subtlety of their characters (the understated theme in the book of both being outsiders,both having had to earn their places at their universities rather than gain them through favouritism) lends them realism.
Benford's book is good but slightly overlong: an excellent example of the diversity of style inherent in intelligent science fiction. It is also a good advertisement for the excellent Millenium Masterworks SF series. I wonder if the publishers would consider the long out of print "A for Andromeda" as a companion piece to Benford's book?