The Couple on Maple Drive: Sam Carrington

You think you'd know a killer if you met one?

Think again.

When Isla McKenzie is brutally mugged, it's her boyfriend Zach who's there for her, who moves in to look after her when she can barely bring herself to leave the house.

But then something else happens, right on their doorstep. And it's almost like someone's out to get her…

Can Isla and Zach find out the truth before it's too late? …Or at least before the secrets they're hiding from each other surface?

Because those may be even deadlier…