David Graham

Melinda's mysterious new neighbor is haunted by an old classmate's dead grandfather, who suspects Tom kidnapped and killed his granddaughter.

The Doctor, Ian and Susan discover that they have exposed to radiation.

While on holiday in Paris, the Doctor and Romana experience a time distortion. At the Louvre, someone is taking an unusual amount of interest in the Mona Lisa.

The team searches for a 15-year-old prisoner, Malia Norton (HALLEE HIRSH), who disappeared from a girls' detention center after receiving a life-threatening note. The investigation uncovers that Malia was a smart "model resident" who was 13 months into an 18-month sentence for a drunken-driving accident that killed a classmate and crippled her sister's boyfriend. Upon discovering that the detention center's alarm was rigged, Martin wonders if Malia escaped or was a victim of foul play. As the agents probe why Malia was recently manhandled and threatened by other detainees, they also try to locate a man who visited Malia at the facility.

The Doctor and Romana become the reluctant guests of Scarlioni who is planning to steal the Mona Lisa despite having six Mona Lisas hidden in his cellar – all of them genuine.