Cleander looked too busy to speak. His bedside manner must be brisk. He made it plain he had no time for meaningless socialising. Nonetheless, the others treated him as a respected colleague.

'Anacrites!' 1 gave my own colleague a brush-off nod. 'Falco.' He was equally indifferent. 'Dear Anacrites.' Helena forced him to acknowledge her. 'Helena Justina!' When he clasped her hand, greeting her formally, he bent his head obsequiously, showing the grease he always lathered too thickly on his hair. He was wearing a heavy tunic, with a sweaty nap like a mushroom, in a shade of ochre that reflected off his face and made him look bilious.

'So you're all here, to receive your rewards for a year's hard work!' Helena exclaimed to the doctors, trying to dissipate the heat between the Spy and me. She must have worked out that Mastarna, the goatee bearded consultant who used to attend the deceased Gratianus Scaeva, was absent. 'It's rather hard on him to lose out on his Saturnalia bonus, just because his patient happened to have had his head lopped off.' The others were silent, not meeting each other's eyes.

Turning to Cleander, 1 tried the friendly chat which is an informer's trademark: 'We haven't had an opportunity to get to know each other.' He despised the offer. 'As I remember, I was informed you are a "Hippocratic pneumatist"?'

'He's a good doctor despite that!' Aedemon joshed him, while Cleander himself merely inclined his head snootily. He thought it degrading to discuss his craft with me. 'All his patients will tell you how wonderful he is,' Aedemon continued. 'I'm hanging around trying to poach them, but they all adore Cleander far too much.'

'As I understand it,' Helena joined in gamely, 'the Hippocratic approach is a sensible, comfortable regime, encouraging health by diet, exercise and rest. I know someone who is being treated that way,' she told Cleander. It was Zosime's prescription for Veleda. Since he himself was not the favoured physician, Cleander obviously didn't care if the patient was Helena's favourite donkey. She noted it, and changed the subject: 'Of course, any treatment must be very difficult when some patients refuse to help themselves.' Still playing dangerously, this was a veiled reference to Drusilla's alleged habit of over-imbibing wine. Unwilling to talk about his patient, Cleander made a sudden excuse and left us. 'Sometimes gruff ones are the best doctors… Is he a bit of a loner?' 'Married with children,' Aedemon disabused Helena. 'You mean quite normal?' I laughed. 'Horrible to his wife, and distant with his offspring?'

'I expect he blames his work, darling! He is a loyal physician,' Helena commented disingenuously. 'He didn't like me criticising Drusilla. '

'Drusilla Gratiana foolishly blames the gods for her misfortunes,' Aedemon replied. 'Cleander won't have it. He rejects all superstition – irrational assignment of causes – shamanism.'

'He hates me, of course!' giggled Pylaemenes, the dream therapist. 'And what do you think of him?' I asked, keeping it light. 'I would like to know that man's dreams,' exclaimed Pylaemenes, with feeling. 'He's a tortured soul?' 'He has his dark side, I suspect.' 'He is bloody rude,' snarled Aedemon. 'He gave me all Hades, just for supplying Quadrumatus with a scarab amulet. A patient who is drinking his own urine as a laxative deserves a comforter!'

The Chaldean patted the fat man's knee. 'Oh that was a misunderstanding,' he soothed. 'Quadrumatus had a nightmare in which your scarab was eating him -' A nightmare seemed natural, if the man had been drinking his own water. Quadrumatus took a sharp downward lurch in my estimation for submitting to it. 'He gave away the scarab to his cheese-server, and Cleander happened to see the boy with it.'

'So what's wrong with that?' wailed Aedemon. 'The cheese-server needs help. He is permeated by gas. Classic bowel putrefaction. Every conduit in his body must be blocked.' 'I fear you are right,' agreed Pylaemenes gravely. 'His farts are legendary.' I cheered up. At last we had encountered someone attending the Quadrumati who had a sense of humour. 'I'd like to get access to that boy and give him a thorough empty out with wild cabbage,' Aedemon exclaimed.

At that moment Cleander returned. The man had no social skills. Overhearing Aedemon, he scoffed, 'He's just a slave, man; he'll get over it!' We were only discussing flatulence, but this would clearly have been Cleander's attitude whatever the boy suffered from. He then charged in with: 'You're chasing Scaeva's death, Falco? Can we assume you've got nowhere?'

I had met his type before. Some know the effect of their rudeness. Most are just so arrogant they have no idea. I did not need to justify myself to him. Aware of Anacrites watching me, I declared that I would identify the' murderer publicly in the next few days.

'Someone had better look out then!' muttered Cleander in his low, gruff voice. I glanced at Helena but with the Chief Spy standing alongside, neither of us elaborated. I felt the Spy's intense tingle of curiosity. He as good as fetched out a note-tablet and made a memo to himself

Once again, Helena attempted to improve the atmosphere. 'How are your headaches these days, Anacrites?' He jumped. He had been listening in, with the unobtrusive silence that was his favourite technique, a slight smile on his face as he followed everything the rest of us discussed. He hated being made the centre of attention; 1 guessed Helena knew that. She turned to Cleander: 'Our friend here had a bad head injury and still suffers side-effects. 1 wonder if one of his humours may be a little out of balance?'

Surprisingly, this tactic worked. Cleander was at once drawn into a discussion with Anacrites about his famous headaches. He even seemed to be offering cures. Before I could suggest blood-letting from a main artery, Helena pulled me and the others off to one side.

'So Cleander won't let Drusilla Gratiana get away with believing she hits the amphora because she's fated?' Helena asked Aedemon. 'I don't suppose she enjoys being warned off wine – but she puts up with it? It confirms that Cleander's patients think he's marvellous.' 'The rest of us suspect they love him because he's a hot dispenser of poppy juice… Drusilla is in Cleander's pocket because he never seriously insists she dries out. He loathes slaves and freedwomen, so he sees Drusilla even without that scowling maid of hers present, and has complete control. Husband doesn't help,' Aedemon informed us, happily insulting his own patient, Quadrumatus. 'Says "a drop never hurt anyone". He only has to observe Drusilla after a hard bout to know how wrong that is.'

'I don't suppose he does see her tipsy,' suggested Helena. 'This seems like a house where they may well lead separate lives much of the time – and when Drusilla is unfit for society, I expect the scowling Phryne keeps guard.'

While Pylaemenes just winked at me, Aedemon muttered, 'Too much is concealed behind closed doors in this house. Abominations. Quadrumatus is a good judge and has a mind of his own, sure – but that's useless if nobody ever takes notice of his instructions.' It was unclear what abominations had upset him. In a pause, Helena asked, 'So where is Drusilla, our hostess, today?' 'Rumour is, she had a complete nervous breakdown. Swallowing more wine than ever – never got over her brother's awful death.' Aedemon then raised himself upright like an uncoiling reptile and swanned off, following a slave who had a huge tray of seafood bites.

I could see the dream therapist was about to move away too, but I made a last effort: 'So what has Quadrumatus been so lax about?'

Pylaemenes just shrugged.

He sidled off, so we shifted further from Anacrites and Cleander.

We managed to position ourselves beside one of the three-foot silver salvers. It seemed to be wielded by the cheese-server Aedemon and Pylaemenes had mentioned, but I had to leave Helena at risk of his fabled gaseous emissions because Claudius Laeta was gesticulating from a doorway. Helena waved me off to my meeting. I left her discussing Gallic cheese with the server: was it best pounded with pine nuts, hazel nuts or almonds?