A man was gunned down in his flat by a burglar, who then ransacked the flat.

The case was placed in the capable hands of Inspector Gilbert Bodwin of Scotland Yard.

Bodwin’s investigation revealed that one man had planned the crime, another had carried it out, and a third had acted as lookout and fourth one was somehow present unaware of plan.

Bodwin discussed the case at length one evening over dinner at his club with an old friend, Thomas P. Stanwick, the amateur logician visiting from America.

“It’s quite a case,” Stanwick remarked. “Any suspects?”

Bodwin sliced his roast beef. “Yes indeed. Four. We have conclusive

evidence that three of those four were responsible for the crime.”

“Really! That’s remarkable progress. What about the fourth?”

“He had no prior knowledge of the crime and is completely innocent. The problem is that we’re not sure which of the four are the planner, the gunman, the lookout, and the innocent bystander.”

“I see.” Stanwick took more Yorkshire pudding. “What do you know about them at this point?”

“Well, the names of the four are Merrick, Cross, Llewellyn, and Halifax. Halifax and Cross play golf together every Saturday. They’re an odd pair! Halifax can’t drive, and Cross has been out of Dartmoor Prison for only a year.”

“What was he in for?”

“Forgery. We know that Merrick and Halifax kept the flat under the surveillance for several days just before the day the crime was committed, the 17th. Llewellyn and Merrick, with their wives, had dinner together on the Strand on the 12th.”

“An interested compilation,” said Stanwick, “but hardly conclusive. Is that all of it?”

“Not quite. We know that the gunman spent the week before the crime in Edinburgh, and that the innocent bystander was acquainted with the planner and the gunman, but not with the lookout.”

“That’s very helpful,” said Stanwick with a smile. “Bodwin, your case is complete!”

WHO WERE THE PLANNER, THE GUNMAN, AND THE LOOKOUT?

Cross is the gunman, Halifax is innocent, Merrick is the planner, Llewellyn is the lookout?

Cross knows Halifax (golf), Halifax knows Merrick (surveillance duty), Merrick knows Llewellyn (dinner)

The gunman was in Edinburgh for the preceding week, so he wasn't Merrick, Halifax or Llewellyn, they were all somewhere not-in-Edinburgh some time in the week before, leaving Cross to be the gunman, and the rest can be figured out from who knows who.

Anyways... sleeping time now, hopefully that's right, but if not... well my excuse is that there was only 7 minutes between the question and my answer.

I was actually replacing those names in my mind with "Ducky", "Gibbs", etc...

My answer agrees with SK. Nice work.

He's too fast...

+1 Super-King

What 7 minutes...! way to go Super-King

Hi guys, I like crime scene riddles too,.hope you will like this one too

A famous Spanish pianist was killed while playing his piano. His three friends, namely Mr. Cardi, Mrs. Cierva and Mr. Calandre, were the main suspects because they visited him the same day before the crime took place. The police found out that before the victim died, he managed to press the C key in his piano. The police called a musician to solve the crime. After telling the details, he figured who's the killer among the three. Who is the killer and why?