Edge of the Moon

Derek doesn't need a partner. He'd had a partner, and now she was dead. He sure as hell didn't need this spastic, babbling kid as his partner - no matter who thought he was a genius or who his father was. But the SEA required all their agents to have partners, and Director Argent was insisting Derek work with Stiles.

With dead pools surfacing with agent names on them - including Derek's own Pack - he has to ignore his hatred for his new partner and focus on taking down the Benefactor. If he doesn't kill Stiles first.