When Dan Jackson took the reins of the Austin, Texas, police department’s unsolved homicide unit in 2022, his boss approached the detective with a sense of urgency. “My first day on the job, my supervisor asked me to come into his office and shut the door,” Jackson said. “I thought I was already in trouble, for some reason.” Jackson wasn’t in trouble, but he was given serious marching orders: Solve the murders of four teenage girls in a yogurt shop that traumatized the community and shocked