Chain of Thorns Chapter 31 (Chapter 28): Tides of London – Summary and Analysis

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

Summary

Thomas Lightwood leads Jesse and Grace Blackthorn across Mayfair to the Fairchild house, where Grace uses Christopher’s laboratory equipment to work on the fire-messages. Meanwhile, Cordelia Carstairs retrieves her sword Cortana from Alastair, who confesses his fear for her safety. In Edom, Prince Belial offers James Herondale a deal: submit to possession in exchange for Matthew Fairchild’s freedom. James refuses, choosing duty over personal survival. Lucie Herondale prepares to leave the Institute on a secret mission, leaving a note for a sleeping Jesse. Later, Anna Lightwood finally breaks her stoic grief over Christopher’s death and seeks comfort in Ari Bridgestock’s arms.

Key Events

Thomas, Jesse, and Grace navigate Watcher‑infested streets to reach the Fairchilds’ house.
Grace demonstrates surprising competence in Christopher’s laboratory; she and Jesse begin working on the fire‑messages.
Thomas returns to the Institute, where the group is fortifying the building and searching for magical exits from London.
Cordelia asks Alastair for Cortana; he retrieves it from a hidden weapons‑repair room and admits he always feared being the one who watches her walk into danger.
In Edom, Belial arrives on a bird‑demon named Stymphalia and offers James a choice: allow possession or watch Matthew suffer.
James and Matthew refuse, affirming their Nephilim duty to choose the world over personal bonds.
Belial gives them one more day, threatening to harm Matthew if James does not relent.
Lucie packs supplies and slips a note under Jesse’s pillow, kissing his forehead before leaving.
Anna wakes Ari in the night, initiating an intimate encounter; she finally cries over Christopher, and Ari comforts her.

Character Development

Grace Blackthorn: Sheds her frivolous persona; her focused work in the lab reveals the sharp mind she concealed at parties. She yearns for but does not expect Jesse’s forgiveness.
Jesse Blackthorn: Takes on a supporting role, assisting Grace and providing Fireproof runes. His earlier training as a ghost proves useful.
Thomas Lightwood: Confronts his grief for Christopher in the lab, but also acknowledges his own bitterness toward Grace and questions whether he could forgive a sibling’s terrible act.
Alastair Carstairs: Shows vulnerability when he confesses he hates being the one who watches Cordelia take risks; his growth from the proud boy of earlier books is evident.
James Herondale: Chooses duty over his own life and Matthew’s safety, embodying the Nephilim ideal. He gives Matthew a final instruction to be his voice if Belial possesses him.
Matthew Fairchild: Musters his last remaining strength to face Belial standing upright, saving a dose of Christopher’s mixture for this moment.
Lucie Herondale: Acts with mature decisiveness, leaving a note and kiss for Jesse; she sees him as fragile and alive rather than a corpse.
Anna Lightwood: Finally breaks her stone‑like composure; she weeps in Ari’s arms, acknowledging that grief must be shared. Her self‑description as a “chessboard” gives way to Ari’s warmer metaphors.
Ari Bridgestock: Offers unconditional acceptance, insisting that no one must bear pain alone.

Themes, Symbols, and Motifs

Duty vs. personal love: James and Matthew choose the world over each other, echoing the Nephilim oath. Cordelia and Alastair’s conversation about facing Belial together also touches on this tension.
Grief and vulnerability: Anna’s hidden tears and eventual surrender to comfort show that strength includes the willingness to be weak with a trusted partner.
Disguised competence: Grace’s lab skills reverse earlier impressions of her as frivolous; she was always intelligent but hid it.
The tides of London: The chapter’s epigraph and the relentless movement of the Watchers and mind‑controlled mundanes create a motif of restless, unnatural flow.
Light and darkness: The blacked‑out Institute and the single candle in Jesse’s room contrast with the witchlight Ari uses to see Anna crying – truth requires illumination.

Why This Chapter Matters

“Tides of London” advances multiple plotlines while deepening emotional arcs. Grace’s redemption gains credibility as she takes charge of the fire‑message project. Alastair’s confession cements his changed relationship with Cordelia. In Edom, James’s refusal of Belial’s offer raises the stakes for the coming confrontation. Lucie’s secret departure sets up her next move. Most poignantly, Anna’s breakdown humanises her after weeks of stoicism, strengthening her bond with Ari and reminding readers that even the strongest characters need solace.

Study Questions and Answers

1. Why does James refuse Belial’s offer to free Matthew in exchange for possession?
James knows that if Belial inhabits his body, his consciousness will be effectively destroyed. He also believes Belial would use his body to wreak havoc on Earth. As a Nephilim, he chooses the world’s safety over his own life and Matthew’s immediate freedom.

2. How does Grace’s behaviour in the Fairchilds’ lab contradict her earlier portrayal?
Throughout the book Grace was seen as a frivolous party‑girl, but in Christopher’s laboratory she moves with purpose, selects equipment knowledgeably, and focuses on the fire‑messages without needing guidance. Thomas realises her empty‑headedness was always a disguise.

3. What does Ari’s comfort of Anna reveal about the theme of grief?
Ari insists that no one should carry grief alone and that strength includes allowing oneself to be vulnerable. Her acceptance of Anna’s tears – and Anna’s eventual willingness to cry – shows that sharing sorrow deepens relationships rather than weakening them.