Want You Gone - Chris Brookmyre

What if your deepest secret was revealed? Sam Morpeth is growing up way too fast, left to fend for a younger sister when their mother goes to prison and watching her dreams of university evaporate. But Sam learns what it is to be truly powerless when a stranger begins to blackmail her. Who would you turn to? Meanwhile, reporter Jack Parlabane has finally got his career back on track, but his success has left him indebted to a volatile, criminal source. Now that debt is being called in, and it could cost him everything. What would you be capable of? Thrown together by a vindictive and mysterious mutual enemy, Sam and Jack are about to discover they might be each other's only hope.