Ganymede Station - The Destin Chronicles, #4

Millions will die, and it's all her fault... Mel Destin is desperate. Try as she might, a cure for the deadly nano-virus infecting Chloe Cabot remains elusive. With time running out and assassins hunting her across the solar system, she is forced into an unholy alliance with the only person who can help - the man who murdered her childhood friend. What she seeks is hidden on Ganymede, but while searching for it, Mel makes a terrible discovery: one that could drive a wedge between her and her friends aboard Requiem.
Worse still, by accessing the cure, she will unleash a more terrible fate on millions. How will Mel get herself out of this mess?