When a group of 4 friends go for a swim at Watermoon Island they discover two body, they call the NYPD but when one body turns out to be a navy lieutenant, NCIS is called in. How does Beckett, Ziva and Amelia know eachother? and when all things start to get strange everyone starts to realise that life isn't exactly what it used to be will secrets and hearts be broken or will relationships be made. But what is the killer?