Seven Light-Days to Erebus.
In 43 Seconds, James Hayden took us to near-light-speed with the world's first Riggs ship. Now, construction of the second Riggs ship is nearly complete, and in one month Sarah will take the helm. But growing opposition may shut down the program before she gets her chance. When James's last-ditch publicity stunt traps him light-days from rescue, Sarah must decide just how far she's willing to go to save a friend.
Erebus is a hard science fiction novella set in the Hayden's World universe. The story is a 17,000 word novella (< 2 hours to read) and is the perfect size for reading on the go.