More than a century after a catastrophic disaster wiped out most of humanity and covered much of the earth with ice, fifteen-year-old Cass yields to the voice in her head urging her to embark on a dangerous journey across a poisoned sea to the mythical land, Blue.

Derrick "D-Bow" Bowman thought sophomore year would be easier, but his girlfriend Jasmine leaves him for putting too much focus on basketball, the jump shot he worked on all summer is not working, and his father has a heart attack, forcing Derrick to accept that basketball cannot be his only priority.