It appears, in fact, that Stevens's advice did not go unheeded. At Banbury, some twelve miles further down the canal, Joanna made a determined effort to seek alternative transport for the remainder of her journey. Matthew Laurenson, wharfinger at Tooley's Yard, remembered most clearly Joanna's "urgent enquiries" about the times of "immediate coaches to London – and coaches from Oxford to Banbury". But nothing was convenient, and again Joanna was advised to wait until she got to Oxford – now only some 20 miles away. Laurenson put the time of this meeting as approximately 6.30-7 p.m (it is hardly surprising that times do not always coincide exactly in the court evidence – let us recall that we are almost ten months after the actual murder), and was able to give as his general impression of the unfortunate woman that she was "somewhat flushed and afeared".

As it happened, Joanna was now to have a fellow passenger, at least for a brief period, since Agnes Laurenson, the wharfinger's wife, herself travelled south on the Barbara Bray down to King's Sutton Lock (five miles distant); she, too, was called to give evidence at the trial. Recalling that there was "a fellow passenger aboard who looked very agitated", Mrs Laurenson stated that Joanna may have had a drink, but that she seemed completely sober, as far as could be judged – unlike Oldfield and Musson – and that she was clearly most concerned about her personal safety.

The tale now gathers apace towards its tragic conclusion; and it was the landlord of The Crown & Castle at Aynho (just below Banbury) who was able to provide some of the most telling and damning testimony of all. When Mrs Laurenson had left the boat three miles upstream at King's Sutton, it would appear that Joanna could trust herself with the drunken boatmen no longer, according to the landlord, who had encountered her at about 10 p.m. that night. She had arrived, on foot, a little earlier and confessed that she was so frightened of the lecherous drunkards on the Barbara Bray that she had determined to walk along the tow-path, even at that late hour, and to take her chances with the considerably lesser evils of foot-pads and cut-purses. She hoped (she'd said) that it would be safely possible for her to rejoin the boat later when its crew might be a few degrees the more sober. Whilst she waited for the boat to come up, the landlord offered her a glass of stout, but Joanna declined. He had kept an eye on her, however, and noticed that as she sat by the edge of the canal she appeared to be secretly sharpening a knife on the side of the lock (Musson was later found to have a cut on his left cheek, and this could have been, and probably was, made with the same knife). As the boat had drawn alongside Aynho wharf, one of the crew (the landlord was unable to say which) had "cursed the eyes of the woman and wished her in hell flames, for he loathed and detested the very sight of her". As she finally re-boarded the boat, the landlord remembered seeing Joanna being offered a drink; and, in fact, he thought she might have taken a glass. But this evidence must be discounted wholly, since Mr Bartholomew Samuels, the Oxford surgeon who conducted an immediate post-mortem, found no evidence whatsoever of any alcohol in poor Joanna's body.

George Bloxham, the captain of a northward-bound Pickford boat, testified that he had drawn alongside Oldfield's boat just below Aynho, and that a few exchanges had been made, as normal, between the two crews. Oldfield had referred to his woman passenger in terms which were completely "disgusting", vowing, in the rudest language, what he would do with her that very night" or else he would burke her". [3] Bloxham added that Oldfield was very drunk; and Musson and Towns, too, were "rather well away, the pair of 'em".

James Robson, keeper of the Somerton Deep Lock, said that he and his wife, Anna, were awakened at about midnight by a scream of terror coming from the direction of the lock. At first they had assumed it was the cry of a young child; but when they looked down from the bedroom window of the lock-house, they saw only some men by the side of the boat, and a woman seated on top of the cabin with her legs hanging down over the side. Three things the Robsons were able to recall from that grim night, their evidence proving so crucial at the trial. Joanna had called out in a terrified voice "I'll not go down! Don't attempt me!" Then one of the crew had shouted "Mind her legs! Mind her legs!" And after that the passenger had resumed her frightened screams: "What have you done with my shoes – oh! please tell me!" Anna Robson enquired who the woman was, and was told by one of the crew: "A passenger – don't worry!", the crewman adding that she was having words with her husband, who was with her aboard.

Forbidding to Joanna as the tall lock-house must have appeared that midnight, standing sentinel-like above the black waters, it presented her with her one last chance of life – had she sought asylum within its walls.

But she made no such request.

At this point, or shortly after, it appears that the terrified woman took another walk along the towpath to escape the drunken crew; but she was almost certainly back on board when the boat negotiated Gibraltar Lock. After which – and only some very short time after – she must have been out walking (yet again!) since Robert Bond, a crew-hand from the narrow-boat Isis, gave evidence that he passed her on the towpath. Bond recorded his surprise that such an attractive woman should be out walking on her own so late, and he recalled asking her if all was well. But she had only nodded, hurriedly, and passed on into the night. As he approached Gibraltar lock, Bond had met Oldfield's boat, and was asked by of its crew if he had seen a woman walking the path, the man adding, in the crudest terms, what would do to her once he had her in his clutches once again.

No one, apart from the evil boatmen on the Barbara Bray, was ever to see Joanna Franks alive again.

Chapter Eleven

As with Part One, Morse found himself making a few notes (mentally, this time) as he read through the unhappy narrative. For some reason he felt vaguely dissatisfied with himself. Something was nagging at his brain about Part One; but for the present he was unable to put a finger on it. It would come back to him once he'd re-read a few pages. No hurry, was there? None. The theoretical problem which his mind had suddenly seized upon was no more than a bit of harmless, quite inconsequential amusement. And yet the doubts persisted in his brain: could anyone, anyone, read this story and not find himself questioning one or two of the points so confidently reported? Or two or three of them? Or three or four?

What was the normal pattern of entertainment for canal boatmen, like Oldfield, on those 'protracted stops' of theirs? Changing horses was obviously one of the key activities on such occasions, but one scarcely calculated to gladden every soul. Dropping in at the local knocking-shop, then? A likely port-of-call for a few of the more strongly sexed among them, most surely. And drink? Did they drink their wages away, these boatmen, in the low-beamed bars that were built along their way? How not? Why not? What else was there to do? And though drink (as the Porter once claimed) might take away the performance, who could gainsay that frequently provoked the desire? The desire, in this case, to rape a beautiful woman-passenger.