This dramatic love story takes place in a British prison. Rachel, a young dentist, decides to take a part-time job at a nearby prison after she and her husband are separated. There, she meets Philip, whose ten-year incarceration for killing his girlfriend is almost up. Rachel and Philip fall in love, which is a breach of Rachel's professional contract. Towler, fellow inmate and former drug dealer, finds out and blackmails Rachel into bringing contraband to prison. When Rachel learns that she is to bring a gun to Towler, she changes her mind, but as she tries to leave she finds herself a target in a shoot-out.