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!.