“I don’t have a driver’s license,” she said, as if I needed a reminder that my life was presently being controlled by a twelve-year-old. “I call shotgun.”

“Calling shotgun” didn’t seem appropriate for a hearse. Nevertheless, Meg skipped to the passenger’s side and climbed in. I got behind the wheel. Soon we were out of the airport and cruising north on I-880 in our rented black grief-mobile.

Ah, the Bay Area…I’d spent some happy times here. The vast misshapen geographic bowl was jam-packed with interesting people and places. I loved the green-and-golden hills, the fog-swept coastline, the glowing lacework of bridges, and the crazy zigzag of neighborhoods shouldered up against one another like subway passengers at rush hour.

Back in the 1950s, I played with Dizzy Gillespie at Bop City in the Fillmore. During the Summer of Love, I hosted an impromptu jam session in Golden Gate Park with the Grateful Dead. (Lovely bunch of guys, but did they really need those fifteen-minute-long solos?) In the 1980s, I hung out in Oakland with Stan Burrell—otherwise known as MC Hammer—as he pioneered pop rap. I can’t claim credit for Stan’s music, but I did advise him on his fashion choices. Those gold lamé parachute pants? My idea. You’re welcome, fashionistas.

Most of the Bay Area brought back good memories. But as I drove, I couldn’t help glancing to the northwest—toward Marin County and the dark peak of Mount Tamalpais. We gods knew the place as Mount Othrys, seat of the Titans. Even though our ancient enemies had been cast down, their palace destroyed, I could still feel the evil pull of the place—like a magnet trying to extract the iron from my now-mortal blood.

I did my best to shake the feeling. We had other problems to deal with. Besides, we were going to Camp Jupiter—friendly territory on this side of the bay. I had Meg for backup. I was driving a hearse. What could possibly go wrong?

The Nimitz Freeway snaked through the East Bay flatlands, past warehouses and docklands, strip malls and rows of dilapidated bungalows. To our right rose downtown Oakland, its small cluster of high-rises facing off against its cooler neighbor San Francisco across the bay as if to proclaim, We are Oakland! We exist, too!

Meg reclined in her seat, propped her red high-tops up on the dashboard, and cracked open her window.

“I like this place,” she decided.

“We just got here,” I said. “What is it you like? The abandoned warehouses? That sign for Bo’s Chicken ’N’ Waffles?”

“Nature.”

“Concrete counts as nature?”

“There’s trees, too. Plants flowering. Moisture in the air. The eucalyptus smells good. It’s not like…”

She didn’t need to finish her sentence. Our time in Southern California had been marked by scorching temperatures, extreme drought, and raging wildfires—all thanks to the magical Burning Maze controlled by Caligula and his hate-crazed sorceress bestie, Medea. The Bay Area wasn’t experiencing any of those problems. Not at the moment, anyway.

We’d killed Medea. We’d extinguished the Burning Maze. We’d freed the Erythraean Sibyl and brought relief to the mortals and withering nature spirits of Southern California.

But Caligula was still very much alive. He and his co-emperors in the Triumvirate were still intent on controlling all means of prophecy, taking over the world, and writing the future in their own sadistic image. Right now, Caligula’s fleet of evil luxury yachts was making its way toward San Francisco to attack Camp Jupiter. I could only imagine what sort of hellish destruction the emperor would rain down on Oakland and Bo’s Chicken ’N’ Waffles.

Even if we somehow managed to defeat the Triumvirate, there was still that greatest Oracle, Delphi, under the control of my old nemesis Python. How I could defeat him in my present form as a sixteen-year-old weakling, I had no idea.

But, hey. Except for that, everything was fine. The eucalyptus smelled nice.

Traffic slowed at the I-580 interchange. Apparently, California drivers didn’t follow that custom of yielding to hearses out of respect. Perhaps they figured at least one of our passengers was already dead, so we weren’t in a hurry.

Meg toyed with her window control, raising and lowering the glass. Reeee. Reeee. Reeee.

“You know how to get to Camp Jupiter?” she asked.

“Of course.”

“’Cause you said that about Camp Half-Blood.”

“We got there! Eventually.”

“Frozen and half-dead.”

“Look, the entrance to camp is right over there.” I waved vaguely at the Oakland Hills. “There’s a secret passage in the Caldecott Tunnel or something.”

“Or something?”

“Well, I haven’t actually ever driven to Camp Jupiter,” I admitted. “Usually I descend from the heavens in my glorious sun chariot. But I know the Caldecott Tunnel is the main entrance. There’s probably a sign. Perhaps a demigods only lane.”

Meg peered at me over the top of her glasses. “You’re the dumbest god ever.” She raised her window with a final reeee SHLOOMP!—a sound that reminded me uncomfortably of a guillotine blade.

We turned northeast onto Highway 24. The congestion eased as the hills loomed closer. The elevated lanes soared past neighborhoods of winding streets and tall conifers, white stucco houses clinging to the sides of grassy ravines.

A road sign promised CALDECOTT TUNNEL ENTRANCE, 2 MI. That should have comforted me. Soon, we’d pass through the borders of Camp Jupiter into a heavily guarded, magically camouflaged valley where an entire Roman legion could shield me from my worries, at least for a while.

Why, then, were the hairs on the back of my neck quivering like sea worms?

Something was wrong. It dawned on me that the uneasiness I’d felt since we landed might not be the distant threat of Caligula, or the old Titan base on Mount Tamalpais, but something more immediate…something malevolent, and getting closer.

I glanced in the rearview mirror. Through the back window’s gauzy curtains, I saw nothing but traffic. But then, in the polished surface of Jason’s coffin lid, I caught the reflection of movement from a dark shape outside—as if a human-size object had just flown past the hearse.

“Oh, Meg?” I tried to keep my voice even. “Do you see anything unusual behind us?”

“Unusual like what?”

THUMP.

The hearse lurched as if we’d been hitched to a trailer full of scrap metal. Above my head, two foot-shaped impressions appeared in the upholstered ceiling.

“Something just landed on the roof,” Meg deduced.

“Thank you, Sherlock McCaffrey! Can you get it off?”

“Me? How?”

That was an annoyingly fair question. Meg could turn the rings on her middle fingers into wicked gold swords, but if she summoned them in close quarters, like the interior of the hearse, she a) wouldn’t have room to wield them, and b) might end up impaling me and/or herself.

CREAK. CREAK. The footprint impressions deepened as the thing adjusted its weight like a surfer on a board. It must have been immensely heavy to sink into the metal roof.

A whimper bubbled in my throat. My hands trembled on the steering wheel. I yearned for my bow and quiver in the backseat, but I couldn’t have used them. DWSPW, driving while shooting projectile weapons, is a big no-no, kids.