As Taggie couldn’t bear to wait a second longer, they drove straight to the convent. Now, quivering like a dog in a thunderstorm, she was panicking about her clothes.

‘D’you think I should have stopped off at the hotel and changed into something more motherly?’

Rupert glanced sideways. No-one filled a body stocking like Taggie or had better, longer legs for a miniskirt.

‘You look like a plain-clothes angel.’

‘My skirt isn’t too short?’

‘Never, never.’ Rupert put a hand on her thigh.

By the time they reached the convent, a sanctuary amid the squalor, appalling poverty and brutal crime of the slums, the fare cost almost more than the flight. The Angelus was ringing in the little bell-tower. The setting sun, finding a gap in the dark lowering mountains of the Andes, had turned the square white walls a flaming orange. A battered Virgin Mary looked down from a niche as Rupert knocked on the blistered bottle-green front door. But no-one answered.

‘We should have rung first to check they were in,’ said Taggie, who, despite the stifling heat of the evening, was trembling even more uncontrollably. She looked about to faint.

‘I can’t imagine they’re out at some rave-up.’ Gently Rupert smoothed the black circles beneath her terrified eyes. ‘It’ll be OK, sweetheart.’

He clouted the door again.

Now that he was in Cocaine City, Rupert had never more longed for a line to put him in carnival mood to carry him through the interview ahead. His longing increased a moment later when the door was unlocked and creaked open a few inches and he had a sudden vision that Robbie Coltrane had got in on the act again.

A massive nun, like a superannuated orang-utan, with tiny suspicious eyes disappearing in fat, a beard and hairy warts bristling disapproval, demanded what they wanted. She then insisted on seeing their passports, and looked as though she would infinitely rather have frisked Taggie than Rupert, before grudgingly allowing them in.