Killing Eve review – Sandra Oh and Jodie Comer struggle to keep the final series afloat

It might be funny and sexy, but the spy thriller is out of new ideas. And now even the fabulous costumes are in short supply

Whatever else is going right or wrong with a TV show, it helps if we know immediately which series we're watching. A shimmering brutalist landscape, Russia"written in giant pastel letters, retro-reverb beehive pop on the soundtrack and a woman in biking leathers breaking into a government building wielding a gun and silencer? This can only be Killing Eve (BBC iPlayer).

This is season four. If you didn't catch seasons one to three, what have you missed? Well, there's a diffident but determined intelligence agent called Eve (Sandra Oh), and a fearsome yet brittle assassin called Villanelle (Jodie Comer), and they're obsessed with each other because ... actually we've never fully established why. Anyway, since Eve began tracking Villanelle, what has happened is ... do you know, I'm not properly across that either? A criminal network called the Twelve keeps murdering beloved minor characters, and Eve plans to destroy it, but what the Twelve wants or why we might care has remained murky.