In the final two seasons, Garak shifted his loyalties completely towards the Federation, primarily because his old political rival, Gul Dukat, seized control of Cardassia and aligned it with the Dominion [REF].
In the novel The Crimson Shadow (2013), part of the Star Trek: The Fall miniseries, the Enterprise-E transports Ambassador Garak back home to Cardassia in order to oversee Starfleet's final withdrawal from Cardassian space.