Looking toward the Pool of London from the Trafalgar’s terrace, she thought she could see a plume of white. She suspected that it might be from the smokestack of the London Bridge passenger steamer, but it was hard to be sure. The smoke was barely distinguishable from the general heavy mist that lay across the busy waterway today. The vessels that had passed close to the inn on their way upriver had weight and substance, their timbers groaning faintly as they glided by almost close enough to hail; ships farther off were more like pencil sketches of masts and rigging, lightly made on coarse paper.

Through the naval register, Evangeline had traced the British merchant vessel stationed off the South American coast and assigned to transport and collect the Lancaster expedition party. Its captain now had another command, and was at sea. But the master’s mate had been injured, and retired from the service; a former navy man, he taught navigation and seamanship to officer cadets at the Royal Naval College, Greenwich.

It was, indeed, the steamer. As it came about to the pier, Evangeline made her way through the inn to the river walk, and was almost at the pier gates when Sebastian Becker emerged through them.

“I know I’m late,” he said when he saw her. “Forgive me.”

Evangeline said, “I was curious to see who’d come rolling in first. You or the fog.”

SEBASTIAN SAVED his explanation. He saw no reason to burden Miss Bancroft with his troubles. His wife had suffered a bad night, and he’d felt unable to leave her without first arranging for one of the Evelina nurses to call by.

From the pier it was no more than two hundred yards’ walk to the West Gate of the Royal Naval College. Built as a hospital on the site of a palace, the complex had been run down as such and its great Corinthian halls and domed buildings converted to other uses. All of the pensioners were long gone, and a part of the college was now dedicated to the instruction of naval officers. One hall was a museum, and many of the suites of rooms stood empty.

To enter the railed boundaries of the college was like walking into a small renaissance town, but with broader streets and English weather. A glance from the main avenue toward the building known as the Queen’s House brought an arresting, disconcerting sight: in the square before it stood a full-sized three-masted corvette, landlocked but fully rigged, under full sail with boys manning her yards. In the Queen’s House was the Royal Naval School, the so-called cradle of the navy, where boarded a thousand sons of British seamen and marines. The training vessel Fame had been assembled by shipwrights on solid ground and had nets strung, circus-style, to catch any white-suited unfortunate who might fall from the rigging in the course of his training.

They made their way to the Painted Hall, a public space within the college where anyone might linger between ten o’clock and four. The hall’s polished wooden doors led them into an immense ornately painted chamber, its walls a riot of trompe l’oeil on plaster. Fifty feet above them was a ceiling of even greater dark detail and intensity, paintings in which gods and angels and eighteenth-century heroes fought, flew, and frolicked in one seething mass. A century before, Lord Nelson had lain in state here for the three days before his funeral. Some ten thousand souls were said to have been pressing at the gates on the morning they were opened.

The floor was gray marble. If any part of the interior was not painted, it was gilded. A few visitors browsed at the far end of the enormous room. Sebastian had a cadet sent out with a message for the man they were to meet. With barely a glance at the glories around her, Evangeline said, “I had a letter from Mother.”

“Is she well?”

“She says that the day-trippers have started returning. Not in spite of the murders. Because of them.”

“It happens,” Sebastian said.

“I think it’s awful,” Evangeline said. “The tearooms have stayed open, and old Arthur and some of the others make a few shillings by guiding parties up to the spot where the bodies were found. The people openly admit the reason for their visit. Paying their respects, they call it. They didn’t even know the girls! Yet they’ve read all the newspaper stories and want to gawk at where they lay. What kind of respect is that?”

“I’ve seen it before at the scene of a tragedy,” Sebastian said. “People making a day out of it. They get all the exercise of grief, without personally having to suffer anything.”

“I don’t know who’s worse,” Evangeline said. “Them for making the journey, or those who welcome their money.”

HIS NAME was Albert Wilder, and he’d been the master’s mate on the expedition’s support vessel. Another cadet fetched them to him, in an empty classroom overlooking a cobbled yard. A man of some thirty-odd years, Wilder had been aged by suffering and yet seemed in no way infirm. He wore the instructor’s uniform of double-breasted jacket and peaked cap. He removed the cap in acknowledgment of Evangeline’s presence.

The classroom had a plain wood floor and no desks, only a single square table and a couple of benches. Crowded into the room were four huge and fully detailed ship models, the largest of them with a masthead almost touching the ceiling. These were no toys, but were for the purpose of instruction. On a raised platform stood a complete and functioning ship’s wheel.

Sebastian said, “Thank you for this interview. Did my note give a sufficient explanation?”

“It did,” Wilder said, “though I wondered if you might be better served by reading the surgeon’s log for the return voyage.”

“We’re pursuing everything, Mister Wilder,” Sebastian said. “And I’d like to hear whatever you may have to say.”

He saw Wilder glance at Evangeline. “There are some disturbing details,” Wilder said. “How plainly should I speak?”

The question was addressed to Sebastian, but Evangeline answered it.

“As plainly as the story requires,” she said. “Make no special consideration for me.”

They sat on the cadet students’ benches, and Albert Wilder told them his tale.

HE SAID, “From the moment I saw the nature of Sir Owain’s preparations, I believed that I was looking at a disaster in the making. I’ve lived a modest life, but I’ve observed something about prominent men. They become convinced that their success in business proves the superiority of their opinion in all other things. It doesn’t matter what your skills are, or what it is that you do. They’ll not hesitate to tell you how you ought to be doing it.”

Evangeline said, “I take it you weren’t impressed by Sir Owain?”

“I found him charming, in what little contact I had with him. But when I saw the way that he’d equipped his expedition, I knew that it was doomed in one way or another.”

Sebastian said, “Others must have seen what you saw and reached the same conclusion. Did no one warn him of it?”

“There’s no advising a man who’s rich enough to take a coastal feeder out of service and have it at his disposal for most of a year. Sir Owain was determined to conquer the interior in high style.”

At this point, Wilder paused for a moment. He seemed to feel that he was getting ahead of himself. After regathering his thoughts, he began at the beginning.

He said, “Our company was based in Liverpool. Our sea routes were all along the eastern side of South America, from Venezuela down to Brazil. Our officers were mostly British and our crews a mix of all nations. Are you familiar with the landscape of South America?”

Evangeline said, “Only to recognize the shape of it on the globe.”

Wilder faltered a little. Consciously or not, he’d been addressing himself almost exclusively to the other male present.

With an attempt to include Evangeline, he said, “Our orders were to meet Sir Owain’s party in Caracas and transport them and their equipment to a set-down point on the coast. From there, they’d journey overland to the source of one of the Amazon’s tributary rivers. From the headwater they’d travel all the way down the river in boats, taking measurements as they went.”