Frank pursues a killer who kidnaps teenagers from an upper middle-class neighborhood and forces them to drink human blood. After one is killed and the other is returned home unharmed because his father admitted to making a mistake, Frank is forced to set up a trap to capture the killer before he can harm the third victim.

A SEAL member dies during an anti-terrorism attack on a ship carrying exposives, resulting in questions being asked about how and why he was killed by friendly fire. Rabb and MacKenzie are sent to investigate when one member claims the shooting wasn't an accident. While investigating, they uncover a secret about the dead SEAL.

The staff are shocked when Josh gets the worst call, a fire at his home that left his wife and son dead, his daughter fighting for life.