Where's the pain? he mused, entirely unaware that he was afire with it.

He hobbled, barefoot, across jagged rock, down a slope, and onto the shingle of the beach. Somehow, he started to run. What tatters of clothing remained on him streamed behind.

The Somali snatched up the spear and gave chase, threw the weapon, missed, and gave up.

Other tribesmen lunged for the Englishman but Speke dodged them and kept going. He outdistanced his pursuers and, when he saw that they'd given up the chase, he collapsed onto a rock and chewed through the cord that bound his wrists.

He was faint with shock and loss of blood but knew that he had to find his companions, so, as dawn broke, he pushed on until he reached Berbera. Here he was discovered by a search party led by Lieutenant Herne and was carried to the boat at the mouth of the creek. He'd run for three miles and had eleven wounds, including the two that had pierced the large muscles of his thighs.

They placed him onto a seat and he raised his head and looked at the man sitting opposite. It was Burton, his face bandaged, blood staining the linen over his cheeks.

Their eyes met.

"I'm no damned coward," whispered Speke.

The battle should have made them brothers. They both acted as if it hadand less than two years later they embarked together on one of the greatest expeditions in British history: a perilous trek into central Africa to search for the source of the Nile.

Side by side, they endured extreme conditions, penetrating into lands unseen by white men and skirting dangerously close to Death's realm. An infection temporarily blinded and immobilised Burton. Speke became permanently deaf in one ear after attempting to remove an insect from it with a penknife. They were both stricken with malaria, dysentery, and crippling ulcers.

They pressed on.

Speke's resentment simmered.

He constructed his own history of the Berbera incident, excising from it the most essential element: the fact that a thrown stone had cracked against his kneecap, causing him to step back into the Rowtie's entrance. Burton had looked around at that very instant and had plainly seen the stone bounce off Speke's knee and understood the back-step for the reaction it was. He'd never for one moment doubted his companion's courage.

Speke knew the stone had been seen but chose to forget it. History, he discovered, is what you make it.

They reached the central lakes.

Burton explored a large body of water called by the local tribes "Tanganyika," which lay to the south of the Mountains of the Moon. His geographical readings suggested that it could be the Nile's source, though he was too ill to visit its northernmost shore from whence the great river should flow.

Speke, leaving his "brother" in a fevered delirium, trekked northeastward and found himself at the shore of a vast lake, which he imperiously named after the British monarch, though the tribes that lived on its shores already had a name for it: "Nyanza."

He tried to circle it, lost sight of it, found it again farther to the northor was it the shore of a second lake?-took incomplete, incompetent measurements, and returned to Burton, the leader of the expedition, claiming to have found, on his own and without a shadow of a doubt, the true source of the great river.

They recovered a modicum of health and undertook the long march back to Zanzibar where Burton fell into a fit of despondency, blaming himself for what, by his demanding standards, was inconclusive evidence.

John Speke, less scientific, less scrupulous, less disciplined, sailed back to England ahead of Burton and en route fell under the influence of a man named Laurence Oliphant, an arch-meddler and poseur who kept a white panther as a pet. Oliphant nurtured Speke's pique, turned it into malice, and seduced him into claiming victory. No matter that it was the other man's expedition; Speke had solved the biggest geographical riddle of the age!

John Speke's last words to Burton had been "Good-bye, old fellow; you may be quite sure I shall not go up to the Royal Geographical Society until you have come to the fore and we appear together. Make your mind quite easy about that."

The day he landed in England, Speke went straight up to the Royal Geo graphical Society and told Sir Roderick Murchison that the Nile question was settled.

The Society divided. Some of its members supported Burton, others supported Speke. Mischief makers stepped in to ensure that what should have been a scientific debate rapidly degenerated into a personal feud, though Burton, now recovering his health in Aden, was barely aware of this.

Easily swayed, Speke became overconfident. He began to criticise Burton's character, a dangerous move for a man who believed that his cowardice had been witnessed by his opponent.

Word reached Burton that he was to be awarded a knighthood and should return to England at once. He did so, and stepped ashore to find himself at the centre of a maelstrom.

Even as the reclusive monarch's representative touched the sword to his shoulders and dubbed him Sir Richard Francis Burton, the famous explorer's thoughts were on John Speke, wondering why he was taking the offensive in such a manner.

Over the following weeks, Burton defended himself but resisted the temptation to retaliate.

Life is fickle; the fair man doesn't invariably win.

Lieutenant Speke, it gradually became apparent, had made a lucky guess: the Nyanza probably was the source of the Nile.

Murchison knew, as Burton had been quick to point out, that Speke's readings and calculations were badly faulted. In fact, they were downright amateurish and not at all admissible as scientific evidence. Nevertheless, there was in them the suggestion of a potential truth. This was enough; the Society funded a second expedition.

John Speke went back to Africa, this time with a young, loyal, and opinion-free soldier named James Grant. He explored the Nyanza, failed to circumnavigate it, didn't find the Nile's exit point, didn't take accurate measurements, and returned to England with another catalogue of assumptions which Burton, with icy efficiency, proceeded to pick to pieces.

A face-to-face confrontation between the two men seemed inevitable.

It was gleefully engineered by Oliphant, who had, by this time, mysteriously vanished from the public eye-into an opium den, according to rumour-to pull strings like an invisible puppeteer.

He arranged for the Bath Assembly Rooms to be the venue and September 16, 1861, the date. To encourage Burton's participation, he made it publicly known that Speke had said: "If Burton dares to appear on the platform at Bath, I will kick him!"

Burton had fallen for it: "That settles it! By God, he shall kick me!"

The hansom drew up outside the Royal Hotel, and Burton's mind reengaged with the present. He emerged from the cab with one idea uppermost: someday, Laurence Oliphant would pay.

He entered the hotel. The receptionist signalled to him; a message from Isabel was waiting.

He took the note and read it:

John was taken to London. On my way to Fullers' to find out exactly where.

Burton gritted his teeth. Stupid woman! Did she think she'd be welcomed by Speke's family? Did she honestly believe they'd tell her anything about his condition or whereabouts? As much as he loved her, Isabel's impatience and lack of subtlety never failed to rile him. She was the proverbial bull in a china shop, always charging at her target without considering anything that might lie in her path, always utterly confident that what she wanted to do was right, whatever anyone else might think.

He wrote a terse reply:

Left for London. Pay, pack, and follow.

He looked up at the hotel receptionist. "Please give this to Miss Arundell when she returns. Do you have a Bradshaw?"