“In case you don’t know, Sergeant Duffy, that was a really quite extraordinary bit of forensic medicine. She must have analysed the stomach contents and then compared them with a list of ingredients for every Pot Noodle that Golden Wonder make.”

I wasn’t really in the mood to hear Laura praised to the skies.

“Okay, so she was extremely diligent at her job – how does this help me, Dr Hagan?”

“It helps you because it considerably narrows down the window in which the victim died. Since I retired from full-time practice I’ve been fishing a lot more and on occasion I’ve taken a Pot Noodle and a thermos of hot water with me …”

I was getting excited now. The old git was on to something.

“I know for a fact that the Chicken Tikka Pot Noodle was only introduced in November of 1981. I’d seen the advertisements for it and I made a point to try it when it came out as I spent quite a few years in Malaya and thought it might be a nice blend of Indian and Chinese cuisines. Unfortunately it wasn’t that tasty … but this is me running off on a tangent – do you get my drift, Sergeant Duffy?”

“The victim couldn’t possibly have been killed before November of last year,” I said.

“Yes.”

I thanked Dr Hagan and shared the news with the boys.

We called Golden Wonder to confirm the release date of the Chicken Tikka Pot Noodle and they told us that it had been shipped to shops and supermarkets on November 12. It helped a little. Yes, the victim had been alive in November, but he still could have entered Northern Ireland anytime in the last year. Tourists overstayed their ninety-day visas all the time, as did journalists and businessmen. But still, assuming he was a law-abiding citizen, we could cut off the list of names at, say, 30th June 1981 for our initial series of phone calls.

That winnowed the list down to a measly two hundred and fifty over-forty American males who had entered Northern Ireland between 30th June 1981 and 30th March 1982. I drafted in a reserve constable with the unlikely name of John Smith so that we could divide the effort in four. Sixty names each didn’t seem that onerous.

Matty wondered if any Canadians or Brits abroad had joined or been seconded into the First Infantry Division and it was a damn fine point but we couldn’t afford to get sidetracked this early. We took it as a useful fiction that they had not.

We started making phone calls at 1 p.m., which was 8 a.m. on the East Coast.

For once we caught a break and by just three forty-five we had a first-class lead on our hands.

Matty did the call. A man called Bill O’Rourke had put the number of his Veterans of Foreign Wars Lodge as his emergency contact. VFW Post 7608 in a place called Newburyport, Massachusetts, which we discovered was a hop, a skip and jump north of Boston.

A guy called Mike Lipstein was happy to fill Matty in on his buddy Bill who no one had heard from since before Christmas 1981.

Bill was a former IRS inspector who had indeed served in The Big Red One, in North Africa, Sicily, France and Germany. He was an enlisted man who had risen to the rank of First Sergeant by the end of hostilities.

He was also a widower who had retired from the IRS in Boston to take care of his wife Heather who was dying of terminal breast cancer. She had died in September of 1980. It had hit him hard and everyone had told him that he had to get away somewhere. He had taken a trip to Ireland just before Halloween to visit the old country and retrace his roots. He’d gone for a few weeks, loved it and said he was going back to do some more exploring. This second trip was just before Thanksgiving and no one had heard from him since.

“Did he say why he was going to Northern Ireland?” Matty had asked.

His paternal grandparents had come from County Tyrone, Matty had been told.

“Did he keep himself fit by swimming at all?” Matty had wondered, and had been informed that Bill was a keen swimmer and further that he had a condo in Fort Lauderdale, Florida where he usually spent the winters …

“I think I have the bastard!” Matty yelled.

Crabbie and I put down our phones.

“Matty my lad, you have the moves, son,” Crabbie said.

He laughed. “I am sweet to the beat, boys!” and told us all about Mr O’Rourke.

To be on the safe side we worked out our way through the other names on our list but not a single one of them had served in the First Infantry Division.

Now it was action stations. We called the Newburyport Police Department and talked to a Sergeant Peter Finnegan. We explained the situation and Sergeant Finnegan gave us his Bill’s dates and social security number and promised to fax us a copy of his driver’s licence from the DMV. Sergeant Finnegan didn’t know about kids or next of kin but said that he would look into it for us.

I also put in a call to the FBI and after half a dozen suspicious flunkies I got someone who said that he would let me know if Bill had a criminal record. This information had only been forthcoming after a threat to go through the State Department “or the President himself”, which had Matty and Crabbie cracking up in the aisles.

I went in to tell the Chief.

“We may have our John Doe, sir.”

“Who is it?”

“A retired IRS inspector called Bill O’Rourke from Massachusetts.”

“What’s the IRS?”

“Internal Revenue Service. He was a taxman.”

“A taxman. Jesus. There’s your motive.”

“A retired taxman. Born 1919. Apparently he had come here to trace his roots. He’s the right age, he’s a veteran of the right regiment and no one’s heard from the bugger in months.”

“1919, eh? Lucky baby to have survived the influenza.”

“Not so lucky now, of course.”

Brennan nodded. “Who are you following up with?”

“I’ve asked the Yank cops to fax me a copy of his driver’s licence and after a lot of pushing and shoving I even got the FBI to come on board and send me any files they have on him.”

“Why bother the FBI?”

“It’s an unusual case. I just want to be sure that he wasn’t mixed up in anything he shouldn’t have been mixed up in.”

Brennan grinned and slapped his hand into his fist. “You’re dotting the i’s, crossing the t’s. It’s an American after all. I’ll confirm the bad news with the Consulate. They’ll want to know one of their own has definitely met with a sticky end. And the press too, they’ll want a piece of this. The Irish press, the English press, the American press,” Brennan said, starting to see other angles in this case. PR angles. Promotion angles.

“Hold your horses, Chief. If we go to the media everybody’s going to be looking over our shoulder and we’re not completely sure that he’s our stiff,” I complained.

“The newspapers will want this, Duffy. A dead American’s worth a hundred dead Paddies any day of the week,” Brennan said.

Brennan opened his desk drawer and took out the Tallisker single malt. I sat down and was persuaded into a glass.

“Speak now or forever hold your peace,” he said.

“Maybe we should wait a day or two before turning on the spotlights,” I said, trying to erase his overconfident grin.

“O’Rourke’s our lad! I can smell it.”

“What does this magic nose of yours tell you about who killed him?”

“Don’t mock your elders! My intuition comes from years of experience. I had a premonition about Elvis’s death two weeks before he passed on, God rest his soul. I told Peggy and she said I should call Graceland. I didn’t of course. Shame … Lost my train of … What were we … Oh, yes – if it makes you happy, we’ll say that he’s a ‘possible victim’ in a ‘possible homicide’, will that satisfy you?” he asked.

“I suppose so, sir.”

I drank another round of Tallisker and Brennan opened a packet of Rothmans, fired one across to me and lit one for himself. I noticed a sleeping bag bundled up in the corner of the office. I decided not to comment on it.