Sara Gruen's novel "Water for Elephants" featured a circus elephant in captivity. In her new novel "Ape House," a family of bonobo apes are captured to be the main attraction in a reality TV show. Sara Gruen tells Anne Strainchamps she studied linguistics and learned a system of lexigrams so she could communicate directly with the apes housed at the Great Ape Trust in Des Moines, Iowa.