The Circle Trilogy 02: Red Sky Burning

Where do you run when there's no one left to trust?
She survived the hurricane and now Tabby is on the run, hoping she can make it to her old friend Jago before her pursuers catch her.
All she has are questions, about the experiments she saw in the basement of her swim school...about who - or what -she is.
Denzi is also searching for answers after the storm. But each time he connects with a survivor, they disappear.
The environmental activist group The Circle claims responsibility for the hurricane that destroyed Tabby and Denzi's school and caused great damage around the world. Now they threaten further terror if their demands aren't met.