Ming-Zhu Hii

The sight of a crashing plane spreads a wave of unexpected hope through the clearing as Eve and the other survivors search for its fallen pilot. Gavin and Izzy seek help from an unlikely source after the government permanently suspends their mission into the sinkhole.

Eve, Levi and the rest of the search party explore a mysterious fort that raises more questions than answers. With the help of a new ally, Gavin and Izzy embark on a dangerous and unauthorized mission to save their family despite government warnings that they could cause unprecedented disaster.

With time running out before their window home closes, the survivors of the sinkhole hatch a final escape attempt. That plan, however, is put into question when they receive a stark warning from Gavin that their plan will end in disaster and forces Eve to make an impossible choice.

When a chaotic superstorm hits the clearing, a structural collapse puts Marybeth and Lucas' lives in danger. Eve, still at odds with everyone for thwarting their way home, desperately tries to make amends by leading the effort to dig them out. Gavin embarks on a journey into his past, which could provide a crucial piece to saving his family in the present.

With cold weather fast approaching, Eve, Levi and Ty return to the mysterious fort despite their near-death experience there in the hopes they might share their 10,000 BC survival skills. Gavin's attempts to spare Izzy pain threaten to do their relationship more harm than good.