1- Back to Olympus

Nico is in love with someone he can't have. Thalia is in love with someone, but she can't be with him since she's Hunter. But what happens when Thalia and the Hunters get to stay in Camp Half-Blood for a couple of months when Artemis goes to attend things at Olympus? And what happens when Nico is coincidentally there? And most of all, what happens when they're both in love with each other?