If high quality creepiness is their thing, then we also recommend [[Revolver by Marcus Sedgwick|Revolver]] and [[My Swordhand is Singing by Marcus Sedgwick|My Swordhand is Singing]], both by the redoubtable [[:Category:Marcus Sedgwick|Marcus Sedgwick]]. They could also look at [[Verdigris Deep by Frances Hardinge]] and [[Ghost Chamber by Celia Rees]]. I also think [[Bog Child by Siobhan Dowd]] would appeal, as would [[Buried Thunder by Tim Bowler]].