For those of you enjoying this slow, subtle burner your patience is about to be rewarded.

Mona Harcourt (Archie Panjabi) returns home to the UK, badly injured but very much alive. Underneath grief for her murdered brother, Kareem, and anxiety for his missing son, Danny, Mona is furious, believing she’s been set up by British counterterrorism.

Conflicted, Mona plays a dangerous game in order to prove her nephew Danny isn’t a terrorist.

Whether her plan works or backfires, it could spell disaster for the people she loves.

Meanwhile, DCI Vivien Barnes (Claire Skinner) has an uphill job trying to keep tabs on Mona and Danny.

Whatever you do, don’t take your eyes off the second half!