When Aidan, Jess and their five-year-old daughter, Eleonore, move from
America to Clervaux, it seems as if they've arrived in paradise. It
soon becomes evident, though, that the inhabitants' adoration of
their cats is unhealthy. According to a local legend, each time a cat
dies, nine human lives are taken as a punishment. To tourists, these
tales are supernatural folklore, created to frighten children on cold
winter nights. But for the inhabitants of Clervaux, the danger is horrifyingly real.

Initially, Aidan and Jess regard this as local superstition, but when Jess runs
over a cat after a night on the town, people start dying, one by one,
and each time it happens, a clowder of cats can be seen roaming the premises.

Are they falling victim to the collective paranoia infecting the entire
town? Or is something unspeakably evil waiting for them?

Their move to Europe may just have been the worst decision they ever made.