1 9 9 4 – present ▁ ▁Hor ow itz ▁wrote ▁many ▁stand - alone ▁nov els ▁in ▁the ▁ 1 9 9 0 s . ▁ 1 9 9 4 ' s ▁Gran ny , ▁a ▁comedy ▁thr iller ▁about ▁an ▁evil ▁grand m other , ▁was ▁Hor ow itz ' s ▁first ▁book ▁in ▁three ▁years , ▁and ▁it ▁was ▁the ▁first ▁of ▁three ▁books ▁for ▁an ▁audience ▁similar ▁to ▁that ▁of ▁Gro os ham ▁G range . ▁The ▁second ▁of ▁these ▁was ▁The ▁Switch , ▁a ▁body ▁swap ▁story , ▁first ▁published ▁in ▁ 1 9 9 6 . ▁The ▁third ▁was ▁ 1 9 9 7 ' s ▁The ▁Dev il ▁and ▁His ▁Boy , ▁which ▁is ▁set ▁in ▁the ▁Elizabeth an ▁era ▁and ▁expl ores ▁the ▁rum our ▁of ▁Elizabeth ▁I ' s ▁secret ▁son . ▁ ▁In ▁ 1 9 9 9 , ▁The ▁Un hol y ▁Gra il ▁was ▁published ▁as ▁a ▁sequ el ▁to ▁Gro os ham ▁G range . ▁The ▁Un hol y ▁Gra il ▁was ▁renamed ▁as ▁Return ▁to ▁Gro os ham ▁G range ▁in ▁ 2 0 0 3 , ▁possibly ▁to ▁help ▁readers ▁understand ▁the ▁connection ▁between ▁the ▁books . ▁Hor ow itz ▁Hor ror ▁( 1 9 9 9 ) ▁and ▁More ▁Hor ow itz ▁Hor ror ▁( 2 0 0 0 ) ▁saw ▁Hor ow itz ▁expl oring ▁a ▁dark er ▁side ▁of ▁his ▁writing . ▁Each ▁book ▁contains ▁several ▁short ▁horror ▁stories . ▁Many ▁of ▁these ▁stories ▁were