The twin sisters, Ali and Morgan, love and hate relationship.

Includes reading group guides.

"One sister has everything. Her twin hates her for it. Would life be better without Ali? Probably. At least then people might think about Morgan. Ali's always gotten everything -- she doesn't even realize how much Morgan resents her. Ali also doesn't realize that when she shuts Morgan out entirely, she will unleash a chain of events that show just how dangerous the underside of love really is. As their lives spin toward something neither one of them can control, a terrifying crime reveals how those who know us best can destroy us...or save us." --,(Source of summary not specified)