Verlag Laurence King PublishingHelen Friel × Puzzle OdysseyAn Epic Maze AdventureHelen FrielLaurence King PublishingHardcover2021 Midnight MonstersA Pop-up Shadow SearchHelen FrielLaurence King PublishingHardcover2018 Hoakes IslandA Fiendish Puzzle AdventureHelen FrielLaurence King PublishingBuch2018 Midnight CreaturesA Pop-up Shadow SearchHelen FrielLaurence King PublishingHardcover2016