The cruise ship Intrepid is just about out of fuel and this forces their hand even though they would prefer to remain far away from land at this point. A nearby island has offered to trade fuel for food, and they claim they have not been affected by the rage virus, but can these islanders actually be trusted? It really doesn't matter because with the number of Parasitics locked up on the ship if they run out of fuel then they will no longer be able to keep them contained. The monitoring of the Parasitics has also revealed some very disturbing behaviors that show they aren't just mindless killers and then of course there are the Symptomatics - infected individuals who are able to hold back the rage from taking control. With few guns on board and threats inside the ship and out it is clear that the situation has reached the breaking point.
M. L. Banner
The second book picks up right where the first one left off with things seemingly settled down aboard the cruise ship Intrepid but with a flock of infected birds headed their way. The ship has come to grips with the fact that animals all around the world have become violent and after finally containing their own pet related issues they are starting to think that being at sea is going to be a real advantage. Then the birds attack and they come to the realization that the rage disease not only turns animals violent but it can also infect humans. These humans come to be known as Parasitics and they are just as bloodthirsty as their animal counterparts. Now being aboard that cruise ship isn't quite the advantage they thought it might be.
Ted and TJ Williams almost miss their transatlantic cruise due to a volcanic eruption and the resulting impact on air travel throughout Europe. As they adapt their travel plans to reach their ship on time there are a number of curious events going on around them. First there is a dog attack that occurs when they are picking up their rental car, which is particularly impactful to TJ who was traumatized by a dog attack in her past. Then there is an aggressive flock of birds that kills an elderly couple and finally as they board their cruise ship there is a pack of rats that terrorizes the port and causes the massive ship to set off early without the full complement of passengers and crew. At this point Ted starts to piece together the relationship between the volcanic eruption and the animal behavior and he thinks that sailing across the Atlantic might have saved them from a real disaster until the news starts coming in about volcanoes erupting all around the world.