'All routine precautions were taken, Your Excellency!' the warden cried. 'The fellow bit his tongue through and bled to death!'

The judge heaved a deep sigh. Then he said in a calmer voice:

'Well, you could not help it. That man is a ruffian of unusual courage, and if such a man decides to kill himself there is little one can do to prevent it. Go back to the jail and have the junk captain chained hands and feet to the wall. Also put a wooden gag between his teeth. I can't afford to lose another witness!'

When the warden had taken his leave, the archivist came back. He unrolled a long scroll, yellowed by age. It was a pictorial map of Poo-yang, painted one hundred and fifty years before.

Pointing to the north-west section of the city Judge Dee said with satisfaction:

'The water passage is clearly marked here! At that time it was an open watercourse, feeding an artificial lake on the site now occupied by the Taoist temple. Later it was covered up, and Lin Fan's mansion was built over it. Lin Fan must have accidentally discovered this subterranean waterway, and found that the house was even more suitable for his smuggling than he had surmised!'

The judge rolled up the map again. Looking at his assistants he said gravely:

'Better be on your way now! I do hope that you find some clues in Lin Fan's mansion, for we sorely need them!'

Sergeant Hoong, Ma Joong and Tao Gan quickly took their leave, but Chiao Tai made no move to depart. He had taken no part in the discussion, but he had been listening intently to every word said. Pensively pulling at his small moustache he now spoke up:

'If I may speak frankly, Your Honour, I received the impression that Your Honour is loath to discuss the murder of Liang Ko-fa.'

Judge Dee shot him a quick look.

'Your impression is correct, Chiao Tail' he replied calmly. 'I consider discussion of that murder premature. I have a theory about it, but so fantastic that I can hardly believe it. Some time I shall explain it to you and the others. But not now.'

He took a document up from his desk and started reading it. Chiao Tai rose and took his leave.

As soon as the judge was alone he threw the paper on the table. He took from his drawer the thick roll with documents.relating to the case Liang versus Lin. He started reading it, his forehead creased in a deep frown.

When Sergeant Hoong and his two companions had arrived at the Lin mansion, they directly went to the library in the second courtyard. It was a pleasant room with large windows giving on to an elegant landscape garden.

Tao Gan went immediately to the massive desk of carved blackwood in front of the window on the right. He looked casually at the costly set of writing implements standing on its polished top. Ma Joong tried to pull out the drawer in the middle. But it would not open although no lock was visible.

'Wait a moment, brother!' Tao Gan said. 'I have been in Canton, I know the tricks of the cabinet-workers there!'

He ran his sensitive finger-tips along the carving that decorated the front part of the drawer. He soon found the hidden spring. As he pulled the drawer out they saw that it was packed with thick wads of documents.

Tao Gan piled them up on the desk.

'That's your affair, Sergeant!' he said cheerfully.

While the sergeant seated himself in the cushioned armchair in front of the desk, Tao Gan asked Ma Joong to help him push the heavy couch away from the back wall. He scrutinised the wall inch by inch. Then they removed the books from the high shelves, and started examining them.

For a long time there was no sound save the rustling of papers and the muttered curses of Ma Joong.

At last Sergeant Hoong leaned back in his chair.

'Nothing but straight business correspondence!' he announced disgustedly. 'We'll take the whole lot back to the tribunal for further study, perhaps there are some letters that contain veiled allusions to the smuggling. How are you two getting along?'

Tao Gan shook his head.

'Nothing doing!' he said sourly. 'Let's go on to the bastard's bedroom!'

They sauntered to the back courtyard and entered the room with the trapdoor.

There Tao Gan soon discovered a secret panel in the wall behind Lin Fan's bedstead. But it revealed only the closed door of an iron safe with a most complicated lock. Tao Gan worked on it for a considerable time, but finally gave up.

'We must make Lin Fan tell us how to open it,' he said with a shrug. 'Let's have another look at the corridor and the third courtyard of the temple. That's where the scoundrel stored his salt bags, perhaps some of their contents spilled there.'

Revisiting it in daylight they saw even better than the night before how carefully the place had been cleaned. The mats were swept clean, and the stone flags of the corridor had been gone over with a stiff broom, there was not a speck of dust in the grooves, let alone grains of salt.

The three friends went back to the house in low spirits. They searched the other rooms of the mansion, but without success. They were empty, the furniture had been removed when the womenfolk and the servants left for the south.

Noon was approaching, they felt tired and hungry.

'Last week,' Tao Gan said, 'when I was on guard duty here, one of the constables told me there is a small crab restaurant near the fish-market. They stuff the shells with minced crab-meat mixed with pork and onions, and then steam them. That's a local speciality and said to be delicious!'

'You make my mouth water!' Ma Joong growled. 'Let's hurry!'

The restaurant proved a small two-storied building that bore the elegant name of' Kingfisher Pavilion.' A long strip of red cloth hung from the eaves, proclaiming in large characters that choice liquor from the north and south was obtainable there.

When they pulled aside the door-screen they saw a small kitchen. The air was thick with an appetising smell of frying meat and onions. A fat man with naked torso was standing behind an enormous iron pot, armed with a long bamboo ladle. On top of the pot stood a bamboo frame, loaded with piles of stuffed crab shells that were being steamed there. At his side a youngster was busy chopping meat on a large block.

The fat man smiled broadly and shouted:

'Please go upstairs, Excellencies! We shall serve you this very moment!'

Sergeant Hoong ordered three dozen stuffed crabs and three large jugs of wine. Then they climbed the rickety stairs.

When he was half-way up Ma Joong heard a loud noise coming from above. Turning to the Sergeant who was coming up after him he said:

'It seems that there's quite a party going on upstairs!'

But they found the room empty but for one large man who was sitting at the table in front of the window, with his back to them. Bent over the table he was vigorously sucking crab shells, with a prodigious amount of noise. He wore a. black damask jacket over his broad shoulders.

Ma Joong motioned to the others to stay behind. He walked up to the table and laid his hand on the fat man's shoulder, saying gruffly:

'It's a long time since we met, brother!'

The man quickly looked up. He had a large, round face, its lower half was completely covered by a thick, greasy beard. He gave Ma Joong a baleful look. Then he turned to his food again, sadly shaking his large head. Idly picking with his forefinger among the empty shells on the table he said with a sigh:

'People like you, brother, make a man lose trust in his fellow beings. The other day I treated you like a friend. Now they say you are a runner of the tribunal. I suspect that it was you who had me and my men chased away from our comfortable quarters in that temple. Use humanity as a yardstick, my friend, and reflect on your behaviour!'