This episode begins with Percy musing about the lovely song of the "singing dolphins", as a woman is heard rhythmically cooing in the background. The song winds up causing Percy to fall asleep at the helm of the Laughingstock, crashing her into a large, jagged rock jutting out of the waters in a corner of the Cove. Janice and Poppy begin frantically trying to repair their ship before it sinks, all the while fighting sleep.
Eventually, they spot a strange tree growing near the peak of the mountainous rock, and decide it would make great torch wood for distress beacons. Janice goes to fetch it. On her journey, she begins to sleepwalk, which is how she came across Susan Siren.
Susan Siren explains to Janice that she was condemned to Lullaby Rock centuries ago, when a fleet of ships almost crashed due to her hypnotic, sleep-inducing singing. Janice laments that she cannot free Susan, but promises to return to visit if Susan promises to lure another ship (without crashing it) to the rock to rescue them. Susan agrees, and sings a peaceful song about "your hard work at sea" and how "it's earned you a nap".
That day, I came home from school especially drained. I remember that much. What had happened in kindergarten that would leave a five-year-old so exhausted is lost to time, but I remember being tired. So, taking Susan's advice, I switched from a sitting position on the couch to a laying one and let my heavy eyes sink. Only seconds after my eyelids made everything dark, I heard the song end, and Susan boast to Janice:
"Now, watch this."
My eyes fluttered open, eager to see what had happened. However, I was somewhere else. The room was white, as where the sheets on the bed I had apparently been tucked into. There were silver machines surrounding me, beeping monotonously. A little tube poked into my arm and connected it to a hanging pouch of clear liquid. I wanted to touch it, but was afraid of the pain. I wanted to scream, but a large tube had been shoved in my mouth. I wanted to cry and struggle and kick down the walls, but I was too weak, so I settled for sobbing.
After a few minutes of that, a woman in a white dress rushed and and called for a doctor, who simply studied me. He did call my mother, and after I was unhooked from all those machines and latched onto her, exchanging with her happier sobs, she sat me down to explain that I had been in a coma for nearly two years.