Cally O'Neal is officially dead. In her over forty years of being an active secret agent she hasn't used her real name, much less spoken to her sister. So when Michelle interrupts an important mission, by seemingly appearing out of thin air, it's an unexpected reunion. This highly anticipated sequel to the New York Times best seller Cally's War features the return of Michelle O'Neal, the first human Sohon mentat. Sister Time is about life, love and covert operations amongst the universe's ultimate dysfunctional family.