The Apple TV+ drama, starring Gary Oldman, returned to screens this week

Apple TV+’s hit spy drama Slow Horses returned to our screens this week with its hotly-anticipated fourth season – and fans have given their verdict on the opening episode.

Based on Mick Herron’s Slough House novel series, the popular drama follows a group of misfit intelligence agents whose career-ending mistakes have sent them to the dumping ground department of MI5, Slough House, headed up by the rude and often drunk Jackson Lamb, played by Gary Oldman.

Warning! Major spoilers for episode one ahead. 

The premiere episode opened with the bombing of a London shopping centre, which puts MI5’s Diana Taverner (Kristin Scott Thomas) under pressure, while River (Jack Lowden) confided in Louisa (Rosalind Eleazar) about his growing concerns for his grandfather’s apparent dementia.

After some encouragement from Louisa, River decided to pay his grandad a visit at his countryside home that evening. But when David hears a knock at the door from someone claiming to be his grandson, he’s clearly unnerved.

Jack Lowden plays River Cartwright

Arming himself with a gun, David follows the man upstairs to the bathroom and shoots him dead. While viewers don’t get a look at the body, the retired agent is quickly convinced that he’s made a mistake and has murdered his grandson.