Transit is an original novel written by Ben Aaronovitch and based on the long-running British science fiction television series Doctor Who. It features the Seventh Doctor, Bernice and the first appearance of Kadiatu Lethbridge-Stewart. A prelude to the novel, also penned by Aaronovitch, appeared in Doctor Who Magazine #195. Plot Human engineers are preparing to open a new section of the Sol Transit System (STS), a mass transit system that uses transmat technology to send trains instantly between planets, from the solar system to Arcturus. The system begins to experience power drains, which the technicians, known as "Floozies", cannot determine the cause. At Lunarversity on the moon, Kadiatu Lethbridge-Stewart is experiencing financial difficulty and agrees to deliver a batch of drugs to Old Sam, one of the Floozies, for a local dealer. Old Sam is a veteran of the Ten-thousand Day War against the Martians and now cannot survive without combat drugs given to him by the army. Having made the drop off and collected a moneypin in payment, Kadiatu joins the Floozies for a wild night out across the Solar System and sleeps with one named Blondie. The following morning, she wakes up in Beijing, without the moneypin she needs to get home and pay her debts. During the opening ceremony of the Arcturus extension, an unknown force blasts through the tunnel, killing everything in its path. Dodging a ticket inspector, Kadiatu makes her way to King's Cross station as the TARDIS materialises. As the Doctor and Bernice exit the TARDIS, the blast wave hits the station—Bernice and the TARDIS are caught in the blast and disappear, but the Doctor pulls Kadiatu to safety. With the main line shut down till the damage can be repaired, the Doctor cannot retrieve the TARDIS or Benny, and remains with Kadiatu. The pair visit Kadiatu's elderly family friend and blind war veteran, Francine, at her bar on Mars. She agrees to use her underworld contacts to find Blondie (who Kadiatu assumes stole the moneypin while they were making love), and tells Kadiatu that her new friend has two hearts, confirming her suspicions. Long ago, her father told her stories about his grandfather and the mysterious time traveller known as the Doctor. The two go to a cafe in Paris, where the Doctor gets drunk and passes out celebrating the universe's 13500020012th birthday. Benny arrives at Lowell depot a rundown slum on Pluto