The Walking Dead - Episode 4.01 - 4.04 - Titles and Synopsis By DarkUFO (September 26, 2013, 2:29 pm) The Walking Dead

Episode 4.01 - 30 Days Without an Accident
The group lives an ideal life at the prison, and strives to hold onto humanity.

Episode 4.02 - Infected
The group faces a new enemy; Rick and the others fight to protect their hard-won livelihood.

Episode 4.03 - Isolation
A group leaves the prison to search for supplies; the remaining members of the group deal with recent losses.

Episode 4.04 - Indifference
The supply mission faces hurdles; the situation at the prison worsens.

Other Known Episode Titles can be found here (No synopsis of those episodes are currently available)

Source: SpoilerTV