I feel like the Morning Star / Gregory Maguire.

Three teenagers in a post-holocaust survival colony find that their shelter has become a prison and decide to break out.

Bibliographic Details
Main Author: Maguire, Gregory.
Format: Book
Language:English
Published: Cambridge, Mass. : Harper & Row, c1989.
Edition:1st ed.
Subjects:
Description
Summary:Three teenagers in a post-holocaust survival colony find that their shelter has become a prison and decide to break out.
Physical Description:viii, 275 p. ; 22 cm.
ISBN:0060240210 :
0060240229 (lib. bdg.) :