The sex lives of Siamese twins

"When Lucy Brennan, a Miami Beach personal-fitness trainer, disarms an apparently crazed gunman chasing two frightened homeless men along a deserted causeway at night, the police and the breaking-news cameras are not far behind. Within hours, Lucy becomes a hero. Her celebrity is short-lived, though: the 'crazed gunman,' turns out to be a victim of child sexual abuse and the two men are serial pedophiles. The solitary eye-witness, the depressed and overweight Lena Sorenson, thrilled by Lucy's heroism and decisiveness, becomes obsessed with the trainer and enrolls as a client at her Bodysculpt gym. It quickly becomes clear that Lena is more interested in Lucy's body than her own"--Dust jacket flap.