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PJO refers to the 5 book series Percy Jackson and the Olympians by Rick Riordaout greek mythology. On some sites this also extends to the spin off series about Roman mythology Heroes of Olympus (HoO). The two books narrated by Percy Jackson but not really connected Percy Jackson and the Greek Gods and Percy Jackson and the Greek Heroes as well as Percy Jackson the Demigod Files and Heroes of Olympus the Demigod Dairies. The spin off trilogy about Egyptian mythology The Kane Chronicles. The Kane Chronicles/Percy Jackson crossover short e books which is now 1 book called demigods and magicians. The spin off about Norse mythology Magnus Chase and the Gods of Asgard The spin off series coming full circle back to greek with Trials of Apollo.
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