The plot begins in Port St. Lucie, Florida, 2011. Jolyne Cujoh is introduced in jail, claiming to have been framed for murder. She befriends Ermes Costello while being transferred to prison. The circumstances of her accusations are clarified. Jolyne and her boyfriend Romeo Jisso seemingly ran over someone. Romeo, fearful for his future, persuaded Jolyne to not call for help and instead dispose of "the corpse". However, a few days later, Jolyne was arrested.

Meeting her attorney, Jolyne also receives items from her parents, among them an amulet on which she pricks herself before tossing it in anger as it came from her father Jotaro Kujo. She soon develops a strange power that allows her to partly unravel herself into string, using it to help Ermes keep her money. Arriving at the famous Green Dolphin Street Prison situated on an island near the coast, Jolyne has nonetheless trouble accustoming herself to the new environment.

Jolyne meets her new cellmate Gwess, who initially victimizes her. Jolyne then discovers that Gwess's pet parrot is a shrunken man put inside of a parrot skin. For this discovery, Gwess shrinks Jolyne and puts her in a mouse's corpse to scout for a way to escape the prison. The scout goes badly: Jolyne slowly grows back and is subsequently spotted and attacked by Gwess' Goo Goo Dolls. Fully awakening her Stand, Stone Free, Jolyne forces Gwess to shrink her again and escape the guards, returning to her cell.

Having grown, Jolyne begins to affirm her toughness among the other prisoners, at the same time she helps another victimized prisoner gain her money back.

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