Back in Jamaica after decades in the United Kingdom, 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.

Millie reluctantly agrees to work with Holborn in the short term. Meanwhile, Hibiscus and Millie find a new balance in their relationship, and Curtis contemplates a change.

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. Meanwhile, Millie returns to London where she attempts to save Romeo and escape the dangerous forces that are after him.