Europa Deep

From the author of Echogenesis and Stealing Light comes a gripping 22nd Century adventure set among the moons of Jupiter.
There is life on Europa. The first manned expedition disappeared while exploring the vast ocean beneath the ice, and fifteen years later, Cassie White is given the chance to join a second expedition-so long as she agrees to investigate secretive experiments carried out by the first.
But the commander of the deep-space exploration ship Veles has every reason to hate her, and a hostile enemy ship is waiting for them when they arrive at Jupiter. Any attempt at landing may lead to war.
It soon becomes clear the first expedition stumbled onto a secret even greater than the existence of alien life within our own solar system-something hidden in the depths of Europa's lightless ocean for untold billions of years. But before she can uncover it, Cassie must first figure out who on board the Veles is trying to sabotage their mission-and why.