Back in Jamaica after decades in the U.K., detective Millie Black is assigned a case that points to a prominent Kingston family.

Despite mounting pressure, Millie continues to pursue Janet's case, leading her to a disturbing discovery.

After reluctantly agreeing to work together, Millie and Holborn make a breakthrough in the case.

Not knowing whom to trust, Millie goes rogue to get to the bottom of the Somervilles' criminal enterprise before Holborn can interfere; when Janet makes an unexpected decision, Millie must take extreme measures to protect the ones she loves.

In Kingston, Curtis faces the consequences of Millie's actions and must decide what matters most; an undercover Millie arrives back in London and must find and save Romeo before the mysterious "Lindo" can stop her.