In the novel, Largo is "No. 1" in the SPECTRE hierarchy; however, unlike the film, the number is randomly assigned as a security precaution. Nonetheless, Largo is the successor to Ernst Stavro Blofeld and the supreme commander of "Plan Omega". Largo is a large, handsome, athletic man, but his good looks are hard and smarmy. Attractive to women, Largo has satyr-like lips, oiled hair, and a hooked, Roman nose. He is a ruthless, successful criminal who womanizes and lives the high life among wealthy companions. This makes Largo's cover as a seeker of sunken treasure perfect.
Largo makes use of a private hydrofoil yacht, the Disco Volante. Purchased with SPECTRE funds for £200,000, the ship was specially commissioned for use in the shallow Bahamian waters. The craft plays a pivotal role in the seizure and transportation of the two nuclear weapons. Largo also obtained a rented beach property for the operation named Palmyra at Lyford Key. It serves as a residence for his "niece" and a few of his men.
Largo and the crew of the Disco Volante kill the NATO traitor Giuseppe Petacchi and steal the two nuclear warheads aboard the jet. Largo then reports the successful recovery of the weapons to Blofeld via radio. SPECTRE afterwards announces its existence to the world by threatening to destroy a major city in the United States or United Kingdom, unless a ransom of £100,000,000 is paid. This plan is dubbed "Plan Omega" by Blofeld and is overseen by Largo.
Largo is shot through the neck with a harpoon by his mistress, Domino, while he and Bond engage in underwater fighting.