There's a murderer amongst them, and everyone's a suspect . . .
Frank Kittridge is serving life for murdering his son's drug dealer, so when he's offered a deal by Xenosystems Operations - the corporation that owns the prison - he takes it.
He's been selected to help build the first permanent base on Mars. Unfortunately, his crewmates are just as guilty of their crimes as he is.
As the convicts set to work on the frozen wastes of Mars, the accidents multiply.
Until Frank begins to suspect they might not be accidents at all . . .