Originally Aired: July 5, 1959

Gunsmoke #378, "Emma's Departure," centers on Emma Hyde, a lonely prairie farmer's wife desperate for human contact after years of isolation. When Marshal Matt Dillon and Chester stop by her remote farmstead, Emma eagerly welcomes them with pie and coffee, revealing her desperation for conversation and company. Her husband Ben remains emotionally distant, consumed entirely by farm work from sunup to sunset. Emma shows the marshal a box full of money they've saved, enough to send her back to Philadelphia for a visit, but Ben refuses to let her go despite their prosperity. The marshal and Chester encounter Emma's crushing loneliness during their visits while transporting a prisoner named Percy, who claims innocence in a bank robbery.

The situation grows more complex when a telegraph confirms Percy's alibi, forcing Matt to release him. Meanwhile, Emma's isolation deepens as she remains trapped in her loveless marriage, far from civilization and any meaningful human connection. The episode explores themes of prairie loneliness, the harsh realities of frontier life, and the emotional toll of relentless work without companionship or hope for change.