Mouse in the House

Smokey caught a mouse last night. Usually, he eats them when he catches them and I find the tail somewhere on my carpet. Last night he was haunting the area around the attic door, caught a mouse who came out from under the door, and carried this mouse down as usual to the lower floor where he likes to continue his cat-and-mouse ordeal. However, the mouse escaped to flee under the sofa, where it hid for the remainder of the night, eeeeking occasionally. This morning it darted under the piano. Smokey waits.