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Tom is left in charge of a priceless magical ring by his young wizard master. He is then horrified when the ring gets stuck on Jerrys head, who then runs off into the city.

In the city of London, a crook is stealing jewels around the Scotland Yard, and Red, a beautiful singer, is being framed for this crime. Tom and Jerry, as assistants, must help Sherlock Holmes look for clues and track down the real thief to solve this case.

Jerry Shaw is an amiable slacker with an over-achieving twin brother. After his twin dies in an accident, strange things happen to Jerry at a dizzying pace: a fortune shows up in his bank account, weapons are delivered to his flat, and a voice on his cell phone tells him the police are on their way. Jerry follows the voice's instructions, and soon he and a woman he's never met are racing through the city, on to a plane, and eventually to the Pentagon, chased by the FBI. She is Rachel Holloman, a single mom; the voice has threatened her son's death if she doesn't cooperate. The voice seems to know everything. Who is behind it, what is being planned, and why Jerry and Rachel.