Medusa is a monster with snakes for hair; she can turn people who look her in the eye to stone. To pass in the mortal world, she poses as Aunty Em, a woman who wears a veil, which conveniently covers her face and snakes. She runs a small hamburger joint and sculpture garden a few miles outside of New York City. However, Percy, Annabeth, and Grover quickly discover that this isn’t as innocent of an endeavor as it might seem at first—Medusa’s food is laced with a sedative, and she appears to regularly take sedated patrons into her sculpture garden for a “photo.” The photo, they realize, petrifies the sitter into stone; her sculptures are all of petrified patrons. Percy manages to behead Medusa and he ships her head to Mount Olympus. After Percy completes his quest, he returns home to Mom’s house to find the box containing Medusa’s head waiting for him. Mom uses the head to petrify Smelly Gabe and sell the resulting sculpture for enough money to pay for her first term of college.