When Damon goes home for a quick trip to get answers from hisfather about his adoption, Simone drops everything to be hissupport system. Thea and Nathaniel immerse themselves insorority life by helping with the gala, but they discoversorority politics are no joke. JR knows what he wants now andis ready to fight for it and Keisha helps push Cam out of hiscomfort zone. Meanwhile, Amara fights for her job as a videoof her criticizing Bringston surfaces.
When an infamous arms dealer, Reymundo Diaz, is released fromprison and bodies start piling up, Torres is forced to facethe repercussions of his actions during an undercover operationhe worked on years ago.
Elena and Pietro meet Nino's family. Nino gives Elena hisfeedback on the manuscript, when he discovers that Pietro hasnot read it he shows hostility towards her, but in a veiledand underhanded way. Pietro's reaction to Nino'spassive-aggressive attacks only confirms Elena's doubts abouther husband.
The NCIS team investigates a shipwreck carrying exotic animalsthat now threaten the native wildlife on Oahu. Also, Alexsustains a career-ending injury and Kai asks Melanie, a fishand wildlife agent, out on a date.
While Doctor Andrews treats a foster kid for injuries sustainedat his group home, Shaun and team look to Lea's expertise withcars and auto repair to help a patient whose iron lung hasbroken. Meanwhile, the patient's niece, a documentarian,takes an interest in Shaun.
Joe Lycett is joined by Aisling Bea for a trip to the Croatiancity of Split, where they go on a dog walk organised by alocal animal shelter, try their hand at paddleboarding andvisit a museum of stuffed frogs. They also learn to prepare alocal fish dish despite neither of them liking seafood, andexplore the maze of alleys and squares that were once a palacebuilt by the Roman emperor Diocletian.