A single brutal fate

"Rat Evans knows that they shouldn't have made a deal with Isola, a shadowy raven knight older than the stars and more powerful than the strongest arcanists. They know Isola can't be trusted, know that promising to go with her once all of this is over was a mistake. But they'd needed to make sure their friends were safe -- that Harker was safe, even though they're still not sure if he's a friend or a rival or something more complicated. And even if Isola's been keeping him locked away at the tower for almost two months. Now Rat needs to search Bellamy Arts for answers on how to get Isola's heart out of the Ingrid Collection. But even with the help of Will, Jinx, and Agatha, the doors to the collection might be the one puzzle Rat can't solve, and Evening is fast on their heels"--