Caraval

When they arrive on the island where Caraval takes place, Tella disappears, and Scarlett learns that whoever finds her first will win the game and a wish. Caraval is a world of glittering shops where you pay with secrets, days of your life or memories, of dresses that change color with the wearer's feelings, of clocks, tunnels and canals, and of performers who may or may not be acting. Everyone repeats a warning that nothing is as it seems and that it is only a game.

Scarlett has always been the cautious sister, and she must learn to take risks to save Tella. Julian, the handsome, secretive sailor who joins her, may be helping her or deceiving her, and she cannot tell whether her growing feelings for him are real. Clues lead from one location to another over five nights, and the twists become more surprising as the game blurs with reality. The book touches on a father's cruelty without graphic detail. The rich descriptions and puzzle-like plot have made it very popular.

Magical, twisty and romantic, followed by Legendary and Finale. About 448 pages in the Flatiron paperback.