It's not an option on goodreads, but I listened to this as an audiobook. I was between reads and it came up on the "now available" list on my library site. So I gave it a shot and was pleasantly surprised. It was an odd read, but a good one.
Callie and her best friend Talia can't wait to see Cleo. She visits for the summer every year, (she's there visiting her grandparents, but they became friends years ago and they can't wait for her to come and stay for the summer). This year Cleo is bringing a friend from school, Polly. It's always a fun summer being on the beach everyday, and they had worked the past couple of summers at the roller skating rink playing the music and renting the skates. This year Polly would join them as well. At first, Callie wasn't sure about Polly. She was beautiful, but very introverted and quiet.
Every year, the girls gave themselves a group project. This year, Cleo came up with the weirdest one, and the parents couldn't know about it. So Callie told her parents they had individual projects this year. Hers was to improve her running time, (it was a goal, just not all the girls). Cleo had seen a video online about a girl who could make herself invisible. She researched it, and she was convinced they could do it.
Callie wanted nothing to do with it. She wanted the girls to take a night job DJing at the local radio station. But she agreed with the stipulation that if it didn't work, they'd do something else. So, they meditated for almost a month, and on the night of the new moon, (I think it was the new moon) they fasted the whole day, then at midnight got into the ocean, (it had to be a salt water bath) and meditated that they wanted to be invisible. And it happened! They all became invisible. It was amazing. And since they did this "activation," they could do it whenever they wanted.
But like all good things, there was also a consequence that came with this ability. Not only that, but there were also other things going on with the girls that had nothing to do with this new super power. Talia's boyfriend Michael. He was so toxic. They fought all the time then made up. But he was always so mean to her, saying hurtful things to her and Callie was tired of their constant repetitive relationship. And Polly. She barely ate. Ever. Callie knew better to bring it up, but she rarely saw the girl eat more than a couple of bites of fruit a day. There's more to that story per Cleo, but it was an issue.
Lots going on in this story. It was a surprisingly good one. I recommend it if you like a good summer read