The Infinite Sea is a young adult science fiction novel written by American author Rick Yancey.

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.

While Cassie and the others anxiously await Ringer, they realize that Teacup has gone missing, and Dumbo and Poundcake set out to find her but return empty-handed.

Both are attacked by child soldiers from Camp Haven and Grace is shot at, giving Evan the opportunity to escape.

Unable to carry him, the group leaves a mortally wounded Poundcake and continues to move away from the hotel.

Poundcake finds the lost explosive device, and blows it up, demolishing the hotel and killing both himself and Grace.

Vosch, Razor, and a woman named Claire enhance her with the 12th system, a piece of Other technology designed to strengthen human anatomy.

The plan is carried out successfully and Ringer forces a pilot to fly them, Jumbo and Teacup in a helicopter.

After meeting at the crash site, Ringer soon discovers that Razor was secretly working with Vosch.

Vosch states that the "Others" could have simply eliminated all humans by dropping a big rock on them and hints there is a specific goal to be gained through the wave attacks.