An innocent young mouse lies murdered in a moonlit field as the screech of an owl echoes across the ripening corn...

The Deptford Mice have escaped the horrors of Jupiter's lair and sought refuge in the countryside with a colony of fieldmice, busy preparing for the great summer festival. But soon they must face terrifying evil once more, as a series of mysterious crimes strike the peaceful fieldmouse community. At first the simple country rodents suspect Deptford newcomer Audrey - however, the truth turns out to be far more sinister.