There seems to be a contradiction in the rules on using hero points to stabilize:
Page 460: "If you have at least 1 Hero Point (page 467), you can spend all of your remaining Hero Points at the start of your turn or when your dying value would increase in order to return to 1 Hit Point, no matter how close to death you are."
Page 467: "Spend all your Hero Points (minimum 1) to avoid death. You can do this when your dying condition would increase. You lose the dying condition entirely and stabilize with 0 Hit Points."
So... the question is, do you return to 1 Hit Point, or 0 Hit Points?