The Blood of Olympus

Percy and Annabeth are out of Tartarus, but the Seven's problems are only beginning. The war with the giants is looming over them, the Romans are about to attack Camp Half-Blood, and Leo has re-occurring dreams of Calypso's island being destroyed. As Gaea grows stronger, the demigods will have to give all they're worth to live through this final and deadly battle. And not everyone will survive.