At a dinner party, Jadzia Dax toys with a piano and finds herself playing an unfamiliar tune despite having no musical training in this life nor in her previous ones.
However, Dax suffers a relapse and experiences a new hallucination of Trill hospital guards in century-old uniforms accosting her.
Frustrated, Sisko, Bashir, and Dax visit the caves where unjoined symbionts are spawned to consult the caretakers.
Sisko and Bashir identify the musical tune Dax heard in her hallucinations as a composition by a Trill named Joran Belar.
According to the official report, Joran was rejected due to his violent temper and murdered the doctor who evaluated him, and was then killed by hospital security.
Sisko and Bashir confront Doctor Renhol, and accuse her of letting Jadzia die in order to protect an even bigger secret.
To prevent this, the government pretends that only a tiny minority of the Trill population are fit to be joined so as to lower the demand for symbionts to a manageable level.
Sisko threatens to expose the secret if Jadzia dies, so Renhol agrees to remove the memory blocks.
The episode was released on June 3, 2003 in North America as part of the season 3 DVD box set.