Treasure Island is an artificial island built in 1936-7 between San Francisco and Oakland. It is accessible via the Oakland Bay Bridge or boat. The island is at high risk of liquefaction during an earthquake as few if any of the building are built to withstand one. Virginia Dare mentions it is name after the novel by Robert Louis Stevenson as he spent sometime there while writing, she also mentions that it is sinking. She pulls on the irony of the name as it is built on landfill. Virginia, Josh Newman and Dr. John Dee use the island to escape the sack men to Alcatraz.