Curious about the song playing in Castle's Season 4 Finale, "Always"? Check out our music guide, then download the track from iTunes!

Song: "In My Veins" by Andrew Belle

Scene: As Kate Beckett relinquishes her police badge and trudges through the rain, a cap and gown-clad Alexis Castle delivers her graduation speech. A haunting song plays atop the stirring dialogue, as we watch the 18-year-old student and the homicide detective close the book on one chapter and dive headfirst into another.

Lyrics: Nothing goes as planned
Everything will break
People say goodbye
In their own special way
All that you rely on
And all that you could fake
Will leave you in the morning
Come find you in the day

Oh, you’re in my veins, and I cannot get you out
Oh, you’re all I taste, at night inside of my mouth
Oh, you run away, cause I am not what you found
Oh, you’re in my veins, and I cannot get you out

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Lindsay Dreyer is an editor at Wetpaint Entertainment. Follow her on Twitter @LindsayNYC.