Todd and Kali are the sort of couple it would be very easy to hate. Attractive, well-groomed and obviously well-heeled, they lead a glistening life of city breaks in Stockholm and extravagant presents. Early on in this thrillingly dynamic two-hander from Frantic Assembly, they reveal that they've been 'doing the late Bergman's entire oeuvre', which should by rights make us want to cosh them. Yet we're swept along in helpless marvel at this conspicuous consumption of happiness. Just maybe they can have it all.

Soon, though, it's clear that there's something rotten in the state of, well, Sweden. Bryony Lavery's script - which wastes not a word and yet manages some lovely poetry - and the Frantics' trademark physical theatre style show the pair to be trapped in a claustrophobic, destructive relationship cycle. It's not by chance that they're off to Stockholm, as they are a textbook case of its Syndrome, a psychological term describing how a prisoner comes to love his jailer.

In the uber-designed kitchen, a long rack of knives manages to be simultaneously chic and psychopathic. Here, co-directors and choreographers Scott Graham and Steven Hoggett get their marvellously athletic performers, Samuel James and Georgina Lamb, to characterise the relationship in movements as well as words. A particularly sinuous and sensuous sequence recreates their initial meeting at a restaurant opening; later on, there's a vicious fight. This is a valuable new work that is, in every way, bruising.

Until 24 May (020 7722 9301, www.hampsteadtheatre.com)