Philadelphia's gun recovery scheme turns up a murder weapon used in a 1987 shooting. While Rush gets to work gathering evidence, Valens tries to end his relationship with Christina.
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.
Christian and Sean operate on a woman abused by her husband, but make things worse. Julia discovers just how sordid Ava's relationship with her son is.
The body of witness Julia Winston, involved in Horatio's son's trial, is found in a swamp. However, Horatio's investigation is interrupted by his extradition to Brazil to face murder charges. Meanwhile, Calleigh is kidnapped.
After Skyler finds a misplaced iPod left at the bookstore, Gavin scores a date with the 23-year-old owner despite concerns about her age.