It doesn’t always work, but an unexpected, perfectly pitched bad-guy turn from national treasure Hugh Bonneville makes I Came By just about worth stopping by for.

A twisty suspense film barbed with social commentary.

It wouldn’t be half as interesting without Bonneville’s deliciously macabre delivery, but there are some very interesting ideas floating around, even if not all of them work.

Babak Anvari is good at creating terror out of unassuming situations, and the first 40 minutes or so of I Came By sees an effective building of tension. Afterwards, though, things start going a little bit downhill.