The ground in still-icy Yosemite National Park isn't stable, and K-9 handler Von Sharpe fears the worst. But his worries are pushed aside when he sees an SUV viciously forced off the road...with his ex-fiancée at the wheel. It's only when Stella Rivers steps out of the vehicle that the very ground under their feet cracks and breaks with the onslaught of a terrifying earthquake. When her meeting with a mysterious client is ambushed, Stella witnesses the man being gunned down by a sniper and becomes a target herself. With the threat of aftershocks triggering landslides and floods, the new mom has no choice but to run to save her baby girl--even if it means teaming up with the man who has no idea he fathered her child. Trapped in a dangerously unstable wilderness with a killer closing in, Von and Stella are running out of time to get to safety. And every fissure reveals a new secret that will shake them to their foundation.