The city's gun recovery program unearths a murder weapon, leading detectives to re-examine a case from 1987 that involved the accidental drive-by shooting of a little girl.
When the body of Julia Winston is found in a swamp, Horatio is arrested for murder. Meanwhile, Calleigh also finds herself in trouble.
Jonas tries to rescue a group of missionaries from Indonesia, but soon finds himself outgunned. Meanwhile Molly, Kim and Tiffy prepare to host a visiting senator.
Sean and Christian repair the face of a woman abused by her husband; Sean and Julia confront Ava about her relationship with her son Adrian.
The team members investigate when a man and his 18-year-old daughter mysteriously go missing. They suspect that the father's hazardous job as a professional crime-scene cleaner is somehow connected to the pair's disappearance.