Elizabeth Carn and sister Rachel are used to people giving them a double take whenever they enter a room together. Although identical twins, one sister is Deaf while the other is hearing. Elizabeth is furious when she learns her long-time friend has been accused of a crime at the community college they both attend in Oregon. She and her fiercely loyal twin sister team up to solve the mystery. However, being sleuths can put them and their friends in danger. As readers follow the adventures of the Carn sisters, they also learn about American Sign Language, deafness, and Deaf culture.