Annie Whitman's new stepsister, Cheryl, is finally having fun in Sweet Valley, thanks to the friendship of her neighbor Steven Wakefield.  Soon everyone--even Steven's twin sisters, Jessica and Elizabeth--assumes that Steven and Cheryl must be a couple.  After all, they're almost always together.
Cheryl and Steven decide that perhaps they should give romance a try.  But are they dating for the right reasons?  Or are they only trying to prove something to the town and to themselves?