'Joss Aaronson has two loves in her life: playing the blues and training to jump through time.
'Then Mavkel, the first alien student on Earth, selects her to be his time-travel partner and Joss’s life gets a lot more complicated. There’s an assassin on campus, an anti-alien lobby group chanting slogans, and Joss is constantly being tracked by the tight security around her new friend.
'Life with Mavkel is not all bad, though. Music-loving Joss is fascinated by him and his people, the Chorians, who communicate through song.
'But Mavkel is pining for his lost twin, and his will to live is draining away. Joss wants to help him, and that means going back to the petri dish where it all began. She’s playing with history, but if Mavkel doesn’t survive, then Joss could really be singing the blues …'
Source: Author's website.