@Ali-007 I don't know if you mean new books but I have an idea anyway it goes like this:
Percy doesn't get betrayed but has a falling out with annabeth and they have a mutual break up but are still bffs he gets sent on this quest the gods say will take a month but when he doesn't return for 3 months they go searching for him before they start searching this wolf shows up at artemis' camp. And artemis being who she is takes him in after he proved himself a worthy hunter at this point, percy, is searching for a way to bring zoe's soul back from the stars because after thinking about it (I know right he never thinks) he realized that what little time he spent with her was better than the time he spent with annabeth. In doing so he runs into artemis and her hunt. The wolf, being a good protector, thinks he is a threat and attacks before artemis could say otherwise, and the potion in his hand he made for bringing zoe back spills on both of them. After a long [and painful] process they merge into two souls with the same bodies type of deal. The wolf soul wild, free and untameable while percy is determined and incomplete. They constantly fight for dominance percy wins during the day but the wolf wins during the night (but is not a werewolf) When percy finally makes the right spell to bring zoe back he does. And now the wolf stops fighting him for control because with zoe near him he is complete and stronger than ever.
I'll leave the rest of the plot to you if you actually read this and decide if it is worthy or not.