Here are the lyrics, the song references several other Maurice Walsh books, too.

The birds are singing in the hills, while rivers run below,
Green rushes whisper in the glen, the soft winds gently blow,
A wretched woman weeps alone, the sun sinks lower and lower,
The quiet man is searching for, the key above the door.

When stranger bands roamed o'er the land, he joined the Fenian men,
The Kerry boys were well prepared, for trouble in the glen,
The road to nowhere turned dark with ugly alien gore,
The quiet man was dreaming of, the key above the door.

This hill is mine, this hill is mine, we'll hold with sword and gun,
No stranger's hand will take our land, while lonely rivers run,
From Ballygrennan on the hill, to Ballybunion's shore,
A soft voice whispers, "come my love," there's a key above the door.

I wish that I were young once more, to be a child again,
There I would meet the quiet man, who roamed the troubled glen,
I'd see the wretched woman smile, as the eagles proudly soar,
And green rushes whispering, there's a key above the door.

Seán Enright and brave Thomasheen, and John Joe loyal and true,
Though you have gone to your long rest, we will remember you,
You'll live forever in our thoughts, we love you more and more,
In the long night we'll dream about, the key above the door.

Now he whose pen spread magic tales, has left this earthly plane,
Dear Maurice, we'll remember you, we'll not forget your name,
Your stories they will never die, they live for evermore,
The quiet man, while rivers run, and the key above the door.