The brand new novella in the Sunday Times #1 bestselling Rivers of London series.

THEY DO THINGS DIFFERENTLY ACROSS THE POND...

When ex-FBI Agent Patrick Henderson calls in an 'X-Ray Sierra India' incident, the operator doesn't understand. He tells them to pass it up the chain till someone does.

That person is Special Agent Kimberley Reynolds. Arriving in snowbound Northern Wisconsin, she finds that a tornado has flattened half the town - and there's no sign of Henderso ...