Some women don't have a kind bone in their body. They take lives without a second thought. A mom sacrifices her son; a greedy book-keeper steals her way to murder and a teen takes her rebellion to shocking heights. These Deadly Women have "No Mercy".

A prim Californian woman chooses to commit a deadly sin rather than live with an immoral husband, a bustling housewife whips up a recipe for riches and greed drives two women to join a murderous poison ring.