The Duplicate

by William Sleator

Published 1 January 1988
When David finds a mysterious machine that can copy living things, he thinks his problems are over. Now he can be in two places at once: at his grandmother's and out on a date. While the other David is in school, the real one can spend the day at the beach. The possibilities are endless. And they turn terrifying. David's duplicate has a mind, ideas, and desires of his own--and one of them is to see the real David dead.

Fingers

by William Sleator

Published 1 January 1983
Eighteen-year-old Sam falls in with his mother's bizarre scheme to revitalize his younger brother's flagging career as a piano prodigy, and agrees to compose "new works" by a long dead composer and present them to his brother as the dictations of a ghost.