I reserved Crewel at the library after reading an excerpt from the sequel on tor.com because I was interested in the premise. Don't read the excerpt if you don't want to be spoiled for some of the revelations in Crewel btw, and there are some spoilers for plot points later in this post as well.
The book opens with Em in a cell, obsessed with & terrified by the drain in the floor and plotting her & her fellow prisoner's escape. Her discovery of a note in her own handwriting in the drain - a note she knows she hasn't written - leads to their success. And the two use their captor's time machine to head back to 4 years earlier to try & stop the seemingly inevitable chain of events that lead to that cell. The other main point of view is Marina - who starts the book seemingly a shallow, sheltered, spoilt teenage girl obsessed with her looks & the boy next door.
Kyra is a teenager living in Washington, D.C. - but this is a Washington after the gods have woken and are walking the Earth among us. After her father disappears she & her friends band together to try & find him. What Kyra finds is that she's not just a normal girl, and the reasons for her father's disappearance have implications for the whole world.