INT. TRAIN CARRIAGE - DAY  
The luxurious train carriage is filled with an air of tension. HERCULE POIROT (a meticulous detective in his 50s) sits across from MR. RATCHETT (a shifty, nervous man in his 40s) at a table. Poirot observes him closely.

POIROT  
(leaning in)  
You are sure, Monsieur Ratchett, that no one on this train means you harm?

RATCHETT  
(sweating)  
I've got enemies, Detective. Dangerous ones. But I... Im not worried. 

CUT TO:  
INT. TRAIN CARRIAGE - LATER  
Poirot examines the other passengersLADY GREGORY (an elegant woman in her 60s), MS. SANDERS (a sharp-eyed woman in her 30s), and COLONEL ARBUTHNOT (a stern military man). They sit nearby, whispering among themselves.

POIROT  
(to the group)  
I must ask, what do you know of Mister Ratchett?  

LADY GREGORY  
(distant)  
He was... unpleasant. Always looking over his shoulder.

MS. SANDERS  
(scoffing)  
Thats because he knew he had secrets worth killing for.

COLONEL ARBUTHNOT  
(firmly)  
And how would you know that, Miss Sanders? 

MS. SANDERS  
(crossing arms)  
Weve all heard the stories. 

CUT TO:  
INT. TRAIN CARRIAGE - EVEN LATER  
Poirot takes notes as each passenger speaks, revealing their connections to Ratchett. 

POIROT  
(to the group)  
Each of you paints a different picture. But what lies beneath?  

LADY GREGORY  
(defensive)  
I barely spoke to him. I was more concerned about my daughters safety.

POIROT  
Your daughter? Is she on this train?  

LADY GREGORY  
(realizing)  
No but Id protect her from any danger, even here! 

COLONEL ARBUTHNOT  
(frowning)  
Shes right. We dont trust him, but we have our own reasons. 

CUT TO:  
INT. TRAIN CARRIAGE - NIGHT  
The atmosphere thickens. The lights flicker as Poirot continues his investigation. He stands, surveying the group.

POIROT  
(turning serious)  
It is imperative you all understandI am not just seeking truth; I am unraveling a murder. 

The passengers exchange nervous glances. 

MS. SANDERS  
(smirking)  
So, you think one of us did it? 

POIROT  
(emphatically)  
One or more. Your connections to Ratchett may hold the key. 

CUT TO:  
INT. TRAIN CARRIAGE - MOMENTS LATER  
Poirot approaches a new passenger, MRS. HARTMAN (a seemingly innocent older woman). He leans closer.

POIROT  
(tactfully)  
Madame, you seem quite observant. What might you know?  

MRS. HARTMAN  
(sweetly)  
Oh dear, I only listen to the whispers of the wind. 

A sudden BANG echoes through the carriage, startling everyone. They turn to see MR. RATCHETT falling forward, lifeless. 

CUT TO:  
INT. TRAIN CARRIAGE - CONTINUOUS  
A heavy silence falls. Poirot remains calm, standing amidst chaos. 

POIROT  
(calmly)  
Now, it appears we have a true mystery, non?  

The passengers stare at the body, then back at each other, fear gripping them.   

FADE OUT.