Marc Fennell

And very quickly, this starts to add up for John.

He finds himself a bit strapped for cash.

So he decides that something's got to give, and unlike a normal person who might, ooh, I don't know, talk to Sarah about his financial situation... He clearly decides to murder Sarah.

John buys the acid.

He sneaks it into Sarah's beer and poisons her before rushing to the train station and heading to London.

And it was on that machine that the long misspelled message that a potential murderer was headed to London was sent on.

It was finally deciphered on the other end and the police were called.

The sergeant lands on the platform and he waits for John's train.

But in case you're picturing this, he's not standing there with a whistle and handcuffs in hand.

No, no.

He doesn't want to cause a scene.

In fact, the sergeant was wearing a coat over his uniform so as not to arouse suspicion and alarm.

The train falls into the station.

John steps onto the platform and he sees the policeman who looks straight back at him.

John fits the description of the telegram perfectly.

This is the guy, the policeman thinks.

And then, John walks straight past him and out of the station.

They follow the Quaker man out of the train station onto a horse-drawn bus and into the city.

The sergeant sits in the conductor's seat and John, when he gets off, he apparently hands him a fare.

Subtly, the sergeant follows John all the way to his home.