, ▁was ▁released ▁on ▁October ▁ 1 2 , ▁ 2 0 1 0 ▁as ▁a ▁hard cover , ▁audio book , ▁and ▁e book . ▁The ▁initial ▁publishing ▁run ▁consisted ▁of ▁ 2 . 5 ▁million ▁copies . ▁The ▁book ' s ▁official ▁publication ▁was ▁preced ed ▁by ▁several ▁" s ne ak - pe ek " ▁releases ▁by ▁Disney - Hy per ion . ▁A ▁graph ic ▁novel ▁version , ▁adapted ▁and ▁illustrated ▁by ▁Or phe us ▁Col lar , ▁was ▁released ▁October ▁ 7 , ▁ 2 0 1 4 . ▁ ▁Follow - up ▁series ▁A ▁sequ el ▁pent al ogy ▁series ▁titled ▁The ▁Tri als ▁of ▁Apol lo ▁was ▁released , ▁with ▁the ▁first ▁install ment , ▁The ▁H idden ▁Oracle ▁released ▁on ▁May ▁ 3 , ▁ 2 0 1 6 . ▁The ▁second ▁install ment , ▁The ▁Dark ▁Prop he cy , ▁was ▁released ▁on ▁May ▁ 2 , ▁ 2 0 1 7 .. ▁The ▁third ▁install ment , ▁The ▁Burn ing ▁Maz e ▁was ▁released ▁on ▁May ▁ 1 , ▁ 2 0 1 8 . ▁The ▁fourth ▁install ment , ▁The ▁T yr ant ' s ▁T omb ▁was ▁released ▁on ▁September ▁ 2 4 , ▁ 2 0 1 9 . ▁ ▁Ach iev ements ▁ ▁Re ception ▁The ▁Lost ▁Hero ▁was ▁a ▁number ▁one ▁best s eller ▁on ▁the ▁lists ▁of ▁The ▁New ▁York ▁Times , ▁USA ▁Today , ▁The ▁Wall ▁Street ▁Journal , ▁and ▁Publish ers ▁Week ly . ▁Many