Abby asked:

what happens in chapter 19 -20

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Rin in chapter 19 the trio will go to the underworld find out hades not the one who stole the lightning bolt while there grover almost got dragged to tartarus and didn't get back percy's mom ( don't worry his mom will return ) they'll also get out alive .
in chapter 20 percy battles ares and wins but ares escapes percy will also find hades's helmet of darkness which ares got from the unnamed traitor in the prophecy .
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by Rick Riordan (Goodreads Author)
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