I tried but I can't keep my mind off  
The man on the train last night  
Something about him is curiously  
Charming my heart

Wearing his hat low  
His collar up high  
Is he tricking me?  
Why didn't I go and ask him  
To give me a light?

He's on my mind  
All the time  
Mr. Mystery  
He's in my heart  
And I don't even  
Know who he is

He's not the kind  
You usually find  
Mr. Mystery

He's in my heart  
Tearing me apart  
All the time

When I go walking  
Through crowds on the street  
I feel his ???  
Thinking and hoping  
We'll be side by side  
Some day

Tossing and turning  
I can't stop this yearning  
To hold him tight

Why didn't I go and ask him  
To give me that light?

He's on my mind  
All the time  
Mr. Mystery  
He's in my heart  
And I don't even  
Know who he is

He's not the kind  
You usually find  
Mr. Mystery

He's in my heart  
Tearing me apart  
All the time

He's on my mind  
He's on my mind  
Mr. Mystery

He's in my heart  
Tearing me apart  
All the time

He's not the kind  
You usually find  
Mr. Mystery

He's in my heart  
Tearing me apart  
All the time  

If you have any clarifications for the lyrics, particularly line 29, let me know in the comments.