This is the second of the 'Karla' books featuring George Smiley. Smiley has found the mole in the circus, and as a consequence, now finds himself heading the department, and has all the problems of rebuilding functionality and morale that this entails.
He also has to try and track down and deal with Karla, to prevent any further problems. As such, he reactivates a part-time agent, and this is where the book gets its title.
A complicated exercise follows, through Asia and elsewhere.
4 out of 5