There is a recent (2009) edition of the same book titled In the First Circle which includes chapters which were removed for the first edition (The First Circle, published 1968). Anyone interested in the title should also consider listening to the two EconTalk podcast episodes relating to the book.

http://www.econtalk.org/kevin-mckenna-on-solzhenitsyn-the-so...

http://www.econtalk.org/kevin-mckenna-on-characters-plot-and...

Also, One Day in the Life of Ivan Denisovich is a much shorter, more easily digested, novel by Solzhenitsyn.