A decade after her explorer father disappeared into an Arctic volcanic fissure hunting for mythical sunstones, doctoral candidate Cora overhears her wealthy prospective stepfather boasting of plundering the discovery. Slipping through the subterranean facility on the eve of her mother's wedding, Cora cracks the vault to reclaim her father's expedition journals. To evade armed perimeter sentries, she ducks into a drilling shuttle, landing in the arms of a handsome stranger.
Morning brings a scorching shock: the mysterious pilot is Jack, her new stepbrother and the best man standing at the altar. Tasked with co-piloting the subterranean expedition into the Earth's molten core, Cora and Jack must navigate treacherous magma caverns and magnetic storms while managing an intoxicating, forbidden intimacy. Deep beneath the crust, Cora fights to uncover the truth of her father's fate.
