Jigsaw — Douglas Smith

Aurora Award Finalist story from a multi-award winning author.
 
Humans are just beginning to explore the outer reaches of our solar system when the wormships are discovered outside the orbit of Pluto.
 
Abandoned? Lost?
 
Or left to be found? Found with charted wormholes in Sol System. Found with incredibly ancient yet perfectly functioning Wormer technology.
 
Five years later, humanity is exploring the stars.
 
But now something has gone wrong with the perfect Wormer technology. The orbit of the wormship, The Johannes Kepler, is decaying, and Cassie Morant, ship geologist, has less than twenty-four hours to solve a planet-sized, eons-old puzzle--or the entire crew will die. Cassie's good at puzzles, but this one has a piece missing. A big piece.
 
Now Cassie has one last chance to save the ship and the man she loves. But time's running out...