The catacombs.

Of all the memories to bring back from Paris, how ironic that her most vivid one would be of human remains. That’s not healthy, she thought as she sat at an outdoor café, savoring one last cup of espresso and a strawberry tart. In two days, I’ll be back in my autopsy room, surrounded by stainless steel, shut off from sunlight. Breathing only the cold, filtered air flowing from the vents. This day will seem like a memory of paradise.

She took her time, recording those memories. The smell of coffee, the taste of buttery pastry. The natty businessmen with cell phones pressed to their ears, the intricate knots of the scarves fluttering around women’s throats. She entertained the fantasy that surely danced in the head of every American who had ever visited Paris: What would it be like to miss my plane? To just linger here, in this café, in this glorious city, for the rest of my life?

But in the end, she rose from her table and hailed a taxi to the airport. In the end she walked away from the fantasy, from Paris, but only because she promised herself she would someday return. She just didn’t know when.

Her flight home was delayed three hours. That’s three hours I could have spent walking along the Seine, she thought as she sat disgruntled in Charles de Gaulle. Three hours I could have wandered the Marais or poked around in Les Halles. Instead she was trapped in an airport so crowded with travelers she could find no place to sit. By the time she finally boarded the Air France jet, she was tired and thoroughly cranky. One glass of wine with the in-flight meal was all it took for her to fall into a deep and dreamless sleep.

Only as the plane began its descent into Boston did she awaken. Her head ached, and the setting sun glared in her eyes. The headache intensified as she stood in baggage claim, watching suitcase after suitcase, none of them hers, slide down the ramp. It grew to a relentless pounding as she later waited in line to file a claim for her missing luggage. By the time she finally stepped into a taxi with only her carry-on bag, darkness had fallen, and she wanted nothing more than a hot bath and a hefty dose of Advil. She sank back in the taxi and once again drifted off to sleep.

The sudden braking of the vehicle awakened her.

“What’s going on here?” she heard the driver say.

Stirring, she gazed through bleary eyes at flashing blue lights. It took a moment for her to register what she was looking at. Then she realized that they had turned onto the street where she lived, and she sat up, instantly alert, alarmed by what she saw. Four Brookline police cruisers were parked, their roof lights slicing through the darkness.

“Looks like some kind of emergency going on,” the driver said. “This is your street, right?”

“And that’s my house right down there. Middle of the block.”

“Where all the police cars are? I don’t think they’re gonna let us through.”

As if to confirm the taxi driver’s words, a patrolman approached, waving at them to turn around.

The cabbie stuck his head out the window. “I got a passenger here I need to drop off. She lives on this street.”

“Sorry, bud. This whole block’s cordoned off.”

Maura leaned forward and said to the driver, “Look, I’ll just get out here.” She handed him the fare, grabbed her carry-on bag, and stepped out of the taxi. Only moments before, she’d felt dull and groggy; now the warm June night itself seemed electric with tension. She started up the sidewalk, her sense of anxiety growing as she drew closer to the gathering of bystanders, as she saw all the official vehicles parked in front of her house. Had something happened to one of her neighbors? A host of terrible possibilities passed through her mind. Suicide. Homicide. She thought of Mr. Telushkin, the unmarried robotics engineer who lived next door. Hadn’t he seemed particularly melancholy when she’d last seen him? She thought, too, of Lily and Susan, her neighbors on the other side, two lesbian attorneys whose gay rights activism made them high-profile targets. Then she spotted Lily and Susan standing at the edge of the crowd, both of them very much alive, and her concern flew back to Mr. Telushkin, whom she did not see among the onlookers.

Lily glanced sideways and saw Maura approaching. She did not wave but just stared at her, wordless, and gave Susan a sharp nudge. Susan turned to look at Maura, and her jaw dropped open. Now other neighbors were turning to stare as well, all their faces registering astonishment.

Why are they looking at me? Maura wondered. What have I done?

“Dr. Isles?” A Brookline patrolman stood gaping at her. “It is-it is you, isn’t it?” he asked.

Well, that was a stupid question, she thought. “That’s my house, there. What’s going on, officer?”

The patrolman huffed out a sharp breath. “Um-I think you’d better come with me.”

He took her by the arm and led her through the crowd. Her neighbors solemnly parted before her, as though making way for a condemned prisoner. Their silence was eerie; the only sound was the crackle of police radios. They reached a barrier of yellow police tape, strung between stakes, several of them pounded into Mr. Telushkin’s front yard. He’s proud of his lawn and he’s not going to be happy about that, was her immediate and utterly inane thought. The patrolman lifted the tape and she ducked under it, crossing into what she now realized was a crime scene.

She knew it was a crime scene because she spotted a familiar figure standing at the center of it. Even from across the lawn, Maura could recognize homicide detective Jane Rizzoli. Now eight months pregnant, the petite Rizzoli looked like a ripe pear in a pantsuit. Her presence was yet another bewildering detail. What was a Boston detective doing here in Brookline, outside her usual jurisdiction? Rizzoli did not see Maura approaching; her gaze was fixed instead on a car parked at the curb in front of Mr. Telushkin’s house. She was shaking her head, clearly upset, her dark curls springing out in their usual disarray.

It was Rizzoli’s partner, Detective Barry Frost, who spotted Maura first. He glanced at her, glanced away, and then did a sudden double take, his pale face whipping back to stare at her. Wordlessly he tugged on his partner’s arm.

Rizzoli went absolutely still, the strobelike flashes of blue cruiser lights illuminating her expression of disbelief. She began to walk, as though in a trance, toward Maura.

“Doc?” Rizzoli said softly. “Is that you?”

“Who else would it be? Why does everyone keep asking me that? Why do you all look at me as though I’m a ghost?”

“Because…” Rizzoli stopped. Gave a shake of her head, tossing unkempt curls. “Jesus. I thought for a minute you were a ghost.”

“What?”

Rizzoli turned and called out: “Father Brophy?”

Maura had not seen the priest standing off by himself at the periphery. Now he emerged from the shadows, his collar a slash of white across his neck. His usually handsome face looked gaunt, his expression shell-shocked. Why is Daniel here? Priests were not usually called to crime scenes unless a victim’s family requested counsel. Her neighbor Mr. Telushkin was not Catholic, but Jewish. He would have no reason to request a priest.

“Could you please take her into the house, Father?” Rizzoli said.

Maura asked: “Is anyone going to tell me what’s going on?”

“Go inside, Doc. Please. We’ll explain later.”

Maura felt Brophy’s arm slip around her waist, his firm grasp clearly communicating that this was not the time for her to resist. That she should simply obey the detective’s request. She allowed him to guide her to her front door, and she registered the secret thrill of the close contact between them, the warmth of his body pressed against hers. She was so aware of him standing beside her that her hands were clumsy as she inserted the key into her front door. Though they had been friends for months, she had never before invited Daniel Brophy into her house, and her reaction to him now was a reminder of why she had so carefully maintained a distance between them. They stepped inside, into a living room where the lamps were already on, lit by automatic timers. She paused for a moment near the couch, uncertain of what to do next.