When Selma Anson's husband dies unexpectedly, she collects a large life insurance payout. But when arsenic is found in his body over a year later, shefinds herself accused of his murder.

As damning evidence piles up, Perry Mason takes on Selma's defense, convinced of her innocence. However, Selma has secrets she's not sharing with Mason that could undermine her case. And someone is trying to frame her by planting evidence.

With a complicated web of romantic interests and potential inheritances at play, Mason races to uncover the truth before Selma is convicted of a crime she didn't commit. But the closer he gets to exposing the real killer, the more dangerous his own position becomes.