Decoherence

Samantha Rose and Linsey MacKenzie have established an idyllic life of married bliss in Australia, away from the Commonwealth Bureau of Investigation, away from mysterious corpses, and—most of all—away from Dr. Emir's multiverse machine.

But Sam is a detective at heart, and even on the other side of the world, she can't help wonder if a series of unsolved killings she reads about are related—not just to each other, but to the only unsolved case of her short career.

She knows Jane Doe's true name, but Sam never discovered who killed the woman found in an empty Alabama field in spring of 2069. She doesn't even know which version of herself she buried under a plain headstone.

When Mac suddenly disappears, Sam realizes she is going to once more be caught up in a silent war she still doesn't fully understand. Every step she takes to save Mac puts the world she knows at risk, and moves her one step closer to becoming the girl in the grave.