"Two Hearts" is a fantasy novelette by American author Peter S. Beagle, written in 2004 as a coda to The Last Unicorn (1968), despite his decades-long reluctance to continue the original story.
Sooz embarks on a quest to recruit the King to save her village, and on the way runs into Schmendrick and Molly Grue (from The Last Unicorn).
However, after being reminded of his younger days and his never-ending quest to once again find the unicorn that loved him (Amalthea), Lír readily accepts the mission and sets off with Sooz, Molly Grue, and Schmendrick to battle the griffin in the Midwood.
When they return to her village, and Lír (accompanied by Schmendrick and Molly) is setting off into the Midwood to slay the griffin, Sooz suddenly pleads with him not to go, fearing for his life.
The genesis of the project came about when Beagle decided to write a story set in the world of The Last Unicorn without necessarily including any of the same characters.