He tracks down Prideaux and other participants in the operation , whose details Control had hidden from him at the time .
Smiley suspects a link between Merlin and the botched Operation Testify .
Smiley tracks down Prideaux and other participants in the operation , whose details Control had hidden from Smiley at the time .
Smiley suspects a link between Merlin and the botched Operation Testify .