By the time they had gotten to the beach Nona was depressed, but it only took her feet being in the salt water to make her happy again. Camilla never came in with her. This was because there were heaps and heaps of jellyfish in the harbour, with their beautiful bodies transparent at the crown and deep indigo at the very tips, and they weren’t at all afraid to come up near to you and brush you. On Nona, this made the place they touched tingle a little, but nothing else. That was why Nona had always swum at dusk, because Cam said the jellyfish sting killed most people within minutes. The water seethed with them because the harbour was closed, and nobody was fixing the barrier nets.

[...]

Nona swam to the nearest pillar, found her footing on a big metal screw, and waited, buffeted by the waves and the brushing lappets of three comfortably stinging jellyfish.

Nona the Ninth - Day Two, Chapter Nine