Heroes of Olympus: Blood of Olympus by Rick Riordan
"My dad gave me a present once," Nico said. "It was a zombie." Reyna stared at him. "What?" "His name is Jules-Albert. He's French." "A ... French zombie?" "Hades isn't the greatest dad, but occasionally he has these want-to-know-my-son moments. Guess he thought the zombie was a peace offering. He said Jules-Albert could be my chauffeur." ..."To take you to the mall," Reyna said. "or the drive-through at In-N-Out Burger." "I suppose....Because nothing helps you make friends faster than a rotting corspe with a French accent." And there you have it. How to make friends. Where could I find one of those zombies?