Percy Jackson 1–5, then Heroes of Olympus 1–5, then Trials of Apollo 1–5. Senior Year Adventures are optional after Heroes. Nico and Will are optional after Trials.
These are separate official series. We list them in one path so you can keep reading. Optional branches stay optional.
Sources: Rick Riordan — Percy Jackson and the Olympians, Rick Riordan — The Heroes of Olympus, Rick Riordan — The Trials of Apollo, Rick Riordan — The Wild Zone
Percy Jackson 1–5, then Heroes of Olympus 1–5, then Trials of Apollo 1–5. Senior Year Adventures are optional after Heroes. Nico and Will are optional after Trials.
Canonical PJO Book 6; chronologically here after Heroes of Olympus, optional in the wider-world order.
Canonical PJO Book 7; chronologically continues the optional Senior Year branch before Trials of Apollo.
Optional Nico/Will continuation; read after The Sun and the Star within the branch.
Short answers, with sources.
Start with The Lightning Thief. For the wider Greek/Roman Camp Half-Blood continuity, read Percy Jackson and the Olympians Books 1–5, then The Heroes of Olympus Books 1–5, then The Trials of Apollo Books 1–5.
Sources: Rick Riordan — Percy Jackson and the Olympians, Rick Riordan — The Heroes of Olympus, Rick Riordan — The Trials of Apollo
They are canonical Percy Jackson and the Olympians Books 6 and 7. In Shelf of Worlds’ wider-world order they form an optional Senior Year branch after Heroes of Olympus and before Trials of Apollo.
Sources: Rick Riordan — Percy Jackson and the Olympians, Rick Riordan — The Chalice of the Gods, Rick Riordan — Wrath of the Triple Goddess
No. Its chronology falls in that gap, but Shelf of Worlds keeps Camp Half-Blood as a separate optional branch rather than making it required step 2.
Sources: Rick Riordan — The Wild Zone
No for the main Percy-centered main path. Read The Sun and the Star and then The Court of the Dead after Trials of Apollo if you want the optional Nico/Will continuation.
Sources: Rick Riordan — The Sun and the Star, Rick Riordan — The Court of the Dead
No. The Demigod Files, The Demigod Diaries and Demigods & Magicians are optional. Shelf of Worlds keeps them outside the main path.
Sources: Rick Riordan — The Demigod Files, Rick Riordan — The Demigod Diaries, Rick Riordan — Demigods & Magicians
These sources support the reading order and important details about the books and their editions.
