Some secrets are worth killing over. FBI Agents Kate Walsh & Declan James are sent to Martha's Vineyard to investigate the murders of two United States senators. A secret meeting of senators and the vice president was held and now people are dying. The timing couldn't be worse as a hurricane is quickly approaching the island preventing anyone from leaving.

Isolated on an estate, those who remain are protecting a dark secret that could end all of their careers. Kate and Declan are left with more questions than answers. Why so little Secret Service protection? Who'd want two prominent senators dead? What secrets do the rest of them hold?

Kate and Declan must untangle the web of lies as the murderer continues their deadly wrath. No one is safe - not even them. Can they break through the wall of silence in time to protect the rest or will the murderer walk free?