Question: is there a second book to the 5th wave

Answer: Yes, The Infinite Sea is a young adult science fiction novel written by American author Rick Yancey. It was published on September 16, 2014 by G.P. Putnam's Sons. The novel is the second in The 5th Wave trilogy, preceded by The 5th Wave and followed by The Last Star. After fleeing from a camp established by aliens, 16-year-old Cassie Sullivan, her brother and a squad of child soldiers attempt to prevent the extermination of the human race.