Plot summary
Singer Graia leads a class of final year novices from The Echorium to the beach, on the pretext of searching for the remains of a ship wreck. Kherron runs away from the group, eager to make his own discovery, and happens upon an injured sailor, named Cadzi, in a cave, whom he promises to help in return for a way off the Isle of Echoes. Meanwhile, Rialle, Frenn and Chissar explore the beach together until Rialle begins to feel faint and hear voices; the group quickly return to The Echorium, where First Singer Eliya tells Rialle she can hear the merlee, and asks her to leave with Second Singer Toharo on the Wavesong the next time it sails, to persuade the merlee to give the ship safe passage. While Rialle prepares for the journey, dismayed that Frenn has been taken for orderly training without saying goodbye, Kherron returns to the Echorium to try to warn the Singers about Cadzi's ship, only to storm off when he is ignored.
Rialle persuades the merlee to briefly stop the storms they have been creating, allowing both the Wavesong and Cadzi and Kherron's row boat to leave the Isle. Cadzi soon falls asleep, but Kherron finds the mainlander ship he spoke about, and persuades the captain Metz to let them on board. He quickly learns that this vessel is hunting merlee for their eggs, and it put to work extracting the eggs from the dead merlee. Rialle, meanwhile, is delighted to find Frenn has stowed away on the Wavesong, and, although she dislikes sea travel, she enjoys meeting the merlee. Briefly, she swims with the merlee and learns what has upset them: they are being hunted and kidnapped by mainlanders. However, she is soon put in danger as the merlee panic at the sight of the hunting vessel Kherron is on. Rialle is saved from drowning by Singer Toharo, but spends the remainder of the voyage unconscious.
Upon arriving in Silvertown, Toharo and Rialle - disguised as an orderly for security - begin to learn that the merlee are being captured on the orders of the Karchlord, a ruler in the mountains, and they must travel there. Kherron, after being attacked by and killing Metz and then discovering the presence of the Wavesong, agrees to travel to the mountains with the hunters, who are Karcholders working for the Karchlord. The Singers first visit Lord Javelly, who is known to be assisting the hunters, where Rialle and Frenn discover quetzal kept in cramped and filthy conditions, a sight which angers Singer Toharo. Rialle is even more appalled when, journeying up into the mountains, she discovers a pool of merlee, frozen to death.
Kherron arrives in the Karchlord's palace, where he meets Lazim - Cadzi's son, who begins to explain the Karchhold to him - and Frazhin, the Khizpriest who can force the truth out of someone with a black khiz spear. Frazhin uses the khiz to test if Kherron is a spy. Kherron then sneaks back to the priest's levels to see what happens to the merlee eggs and discovers the priests injecting them with something which they claim is medicine, but which Kherron suspects is poison. Frazhin then asks Kherron to spy on the newly arrived Singers at a banquet, and he accidentally reveals that Rialle is a Singer. At the banquet, Rialle is shocked to see one of the quetzal from Lord Javelly's palace delivered, to serve the Karchlord as entertainment - quetzal are perfect mimics. That evening, the Singers quickly fall asleep before Singer Toharo can contact the Echorium.
Rialle wakes up drugged in a cage, surrounded by quetzal. Frazhin wants to use the quetzal's mimicking power to steal her Songs and use them to attack the Isle of Echoes. Kherron is tasked with caring for Rialle, as he pretends to despise her, but secretly he promises to help her escape. However, he first asks her to heal the Karchlord Azri, who has stopped eating the priest's poison but is still ill. As soon as she tries, the noise of the quetzal summons the priests and the Challa puts the Karchlord to sleep so he cannot help. Frazhin takes Rialle away, but first she tells Kherron what songs will heal Azri.
As Rialle is led to the Isle of Echoes, becoming increasingly confused as she is repeatedly drugged, Kherron discovers Frenn, who narrowly escaped the avalanche which killed the rest of the Singer delegation and has been left with one arm and leg paralysed. Although the pair initially argue, Frenn is forced to accept that Kherron is now on his side, and Kherron proceeds to heal Azri as instructed so that he can lead a war party after Frazhin. As the war party travels to the coast, they attempt to release the captive quetzal into the forest, but the quetzal, communicating through a reluctant Kherron, insist on coming with the group to rescue the quetzal still in Frazhin's possession.
Rialle wakes up on a boat sailing for the Isle of the Echoes, and asks the merlee to delay their progress with a fog. Frahzin's ships are becalmed, giving Azri's oar-boats time to catch up. A battle begins, and with the help of the merlee and quetzal Azri is soon winning. Frazhin uses his power to push the last remaining boat towards the Isle, and then tries to force Rialle to sing. Fighting against him, she uses Aushan, making it difficult for Azri, Kherron and Frenn to approach and rescue her. When Frazhin's ship begins to sink, he pushes a bound Rialle overboard and tries to escape, only to be attacked viciously by the angry quetzal.
Azri, Kherron and Frenn return to the Isle. Azri makes a peace treaty and swears never to hunt half-creatures again, and Kherron - whom Singer Eliya has been keeping track of through farlistening - is made into a Singer and asks to sing therapy to Frenn to show how he has reformed. The day after the Karcholders leave - all except Lazim, who elects to remain on the Isle - Frenn, Kherron and lazim go down to the beach, where they find Rialle being carried to shore by the merlee. Shortly afterwards, Singer Eliya dies of exhaustion after singing Yehn to several war criminals, including Frazhin and Lord Javelly. After the funeral Eliya shares with Singer Toharo, led by the newly appointed First Singer Graia, Kherron finally apologises to Rialle and, as Frenn begins to regain use of his arm, Rialle realises that the wounds they have suffered will heal over time.
