Helena and I both fell silent, knowing cobra bites to be generally fatal.

The conversation took a turn in a different direction. 'Well, that's my news!' Thalia said. 'So what job are you on now, Falco?'

'Ah. A hard question.'

'With an easy answer,' Helena joined in lightly enough. 'He's not on any job at all.'

That was not quite true. I had been offered a commission only that morning, though Helena was still unaware of it. The business was secret. I mean not just that it would involve working under cover, but that it was secret from Helena because she would strongly disapprove of the client.

'You call yourself an informer, don't you?' Thalia said. I nodded, though with only half my attention on it as I continued to worry about keeping from Helena the truth of what I had just been offered.

'Don't be shy!' Thalia joked. 'You're among friends. You can confess to anything!'

'He's quite a good one,' said Helena, who already seemed to be eyeing me suspiciously. She might not know what I was hiding; but she was beginning to suspect that there was something. I tried to think about the weather.

Thalia tipped her head on one side. 'So what's it about, Falco?'

'Information mostly. Finding evidence for barristers – you know about that – or just listening for gossip, more often than not. Helping election candidates slander their opponents. Helping husbands find reasons to divorce wives they've grown tired of. Helping wives avoid paying blackmail to lovers they've discarded. Helping the lovers shed women they've seen through.'

'Oh, a social service,' Thalia scoffed.

'Definitely. A real boon to the community: Sometimes I trace stolen antiques,' I added, hoping to impose an air of class. It sounded merely as though I hunted down fake Egyptian amulets, or pornographic scrolls.