You can buy Gravity Keeper or Octopus Effect from Penguin



Or from an independent bookstore near you:

Gravity Keeper in paperback: Click here

Octopus Effect in hard cover: Click here



Or you can find it online at Amazon or Barnes and Noble:

Gravity Keeper, Amazon

Octopus Effect, Amazon

Gravity Keeper paperback, Barnes and Noble

Octopus Effect hardcover, Barnes and Noble



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