A routine call to muster on a North Sea oil rig. One man short and a body found hanging in the canteen. High above the raging sea, can Macleod and McGrath uncover the underbelly of fear to reveal a brutal killer?

Six months into production and the death of a well-liked colleague rips apart the community on Scotland's newest oil rig. But beneath the camaraderie and sense of loss, broods a sense of fear and control. As a killer extends their sights to multiple targets, can Macleod stop the murders before the shift completes its final day.

When the sea becomes your cage there's nowhere left to hide!