When a tourist is murdered in Ka'anapali, and it turns out he's someone from Rosie's past, Charlie is on the case. She needs to find out whether or not the man knew about Rosie's defection, or if it's just a coincidence he was killed on the island. And while the stakes couldn't be higher, Charlie finds herself butting heads with the FBI, at the same time as she's getting closer to Jake than ever. And she's not sure that's a bad thing... Charlie has to get to the bottom of this case before Rosie's true identity is revealed, but going up against trained spies is completely outside her wheelhouse. Will Charlie find the killer and protect her friend, or is she going to find herself out in the cold... permanently?