Commissioner Gordon appears to have been assassinated during the opening of a new bridge. A copy of Hemingway's 'For Whom The Bell Tolls' nearly blows up the Batmobile. Both incidents are clues to the Bookworm's latest scheme. Batman and Robin interrogate The Bookworm's henchwoman Miss Limpet but deduce she is leading them into a trap. And while Batman intends to walk right into it, it is Robin who falls first.

Batman saves Robin from the Wayne Memorial Clock Tower at the last possible Big Benjamin second. While they are busy in the Batcave, The Bookworm steals a priceless cookbook from stately Wayne Manor. He then lures the Dynamic Duo into an oversized cookbook on display in the middle of Gotham city and steals the Batmobile. Can Batman and Robin escape before their goose is cooked?

King Tut has relapsed into his kingly ways, this time showing a marked interest in scarab beetles and apothecary potions. Robin infiltrates their hideout to discover their true intentions, relaying what he hears to Batman, but their plan is put in jeopardy when Robin's presence is detected.

Using resurrected scarab beetles, King Tut concocts an ancient mind control potion, abu raubu simbu tu. Chief O'Hara is the first under his spell, followed shortly by Commissioner Gordon, and when Batman himself is tricked into taking the drug, Tut's plan to control all of Gotham City by tainting the water supply seems close to succeeding.

Chandell, the musical virtuoso, visits Gotham City for a piano concert. But unknown to the public, Chandell is being blackmailed into a life of crime by his twin brother Harry, who retains most of the profits. Chandell intends to buy off Harry forever, and he knows just where to get the funds - from the Wayne family fortune. With Batman and Robin out of town, he suspects the robbery will be a piece of cake. However, Batman has been listening to Chandell's concert remotely, and after detecting an anomalous chord, summons Robin back to Wayne Manor to investigate.

Batman and Robin escape Chandell's trap. Once back in the Batcave, they deduce his plan to get the Wayne family fortune by killing Bruce Wayne and Dick Grayson, then marrying the rightful heir, Aunt Harriet. In order to trap the villain, Bruce and Dick fake their own deaths. However, Harry has also figured out his brother Chandell's scheme, and desiring the Wayne fortune for himself, concocts a plan to masquerade as his twin brother.