Liferaft

Liferaft, the 5th book of the Horizon series, was published on September 3, 2019 by Scholastic Inc. The author is Aditi Khorana.

Summary
The spires.

They've been looming in the distance the whole time, watching silently as the young survivors of the crash-landed Aero Horizon Flight 16 crossed a gauntlet of dangerous, unnatural landscapes.

After weeks of terror and heartbreak, Molly and her friends have reached the eerie structure they spotted at the start of their journey, all in a desperate bid that it will provide answers to their ordeal... and perhaps a way home.

Here, the survivors will finally learn the truth behind the rift.

And here they'll encounter a monster far deadlier than anything they've faced yet.

(Summary taken from Amazon description)