The great mouse detective.

In the fog-shrouded streets of Victorian London, a brilliant mouse detective named Basil of Baker Street takes on a case that could be his most dangerous yet: finding the missing father of a young Scottish mouse named Olivia.

As the investigation leads them deeper into the city's underbelly, they are hunted by the ruthless and ambitious Professor Ratigan, a villainous rat who seeks to seize power and destroy everything Basil stands for.

With the help of his loyal sidekicks Fidget and Toby, and the steadfast David Q. Dawson, Basil must outwit Ratigan's schemes and race against time to save Olivia's father and uncover the truth behind a sinister plot.