In this sequel to Ratten – sie werden dich kriegen! (2001), Frank and Katrin return to Frankfurt to take on a pack of genetically mutated vermin. When the the rodents attack, it’s up to Frank and Katrin to stop the scientist responsible for the mutant critters. (IMDb)
https://cinematicdiversions.com/scratch-the-new-sound-of-terror-2004-review/