If you tell me which specific aspect of the finale you'd like to explore further, I can provide:
Michael had confessed to protect his brother, meaning Ridley has spent years directing his grief and hatred toward a man who was ultimately innocent of the specific act. Themes of Legacy and Absolution
Ridley finds himself investigating a family that mirrors his own broken state.
Consistent with the series' "unique hook," Ridley performs a jazz cover—Richard Hawley's "Open Up Your Door". While some find the musical interludes gimmicky, in this finale, the performance acts as a public release of his private sorrow.