Slow Horses: 6 Unexpected Mysteries Season 7 Must Answer

River’s fate remains uncertain

River Cartwright, played by Jack Lowden, collapses at the end of the season after returning to his grandfather David’s empty home. The finale does not explain what caused him to lose consciousness, leaving his condition unresolved.

A possible clue comes from the book series: in the seventh novel, River is exposed to the nerve agent Novichok through his doorknob. The article suggests Season 7 may follow that path, with River surviving but unable to take part in much of the action.

The season’s teaser instead points to Shirley Dander as a main agent alongside Jackson Lamb. How River’s condition affects the team’s plans remains an open question.

The team faces its losses

The danger began with the assassinations of former agents Struan Loy and Kay White. The Slough House team realized that someone was targeting everyone on a list and tried to protect themselves from Frank Harkness and Russian assassins.

The group was later ambushed at a safe house. Emma Flyte was killed, and J.K. Coe was also lost to assassin Jim, leaving the survivors with significant losses. The article says their recovery will likely take time.

Grief may shape what follows

The agents gathered in a church to remember those they had lost, sharing one of David Cartwright’s vintage liquors. Catherine Standish declined a drink, in a moment that underscored the group’s distress.

Although the attack appeared to be over, the survivors remain affected by what happened. Their shared experience has brought them closer, but the psychological effects are likely to carry into Season 7.