and by conrad prebys and debbie turner. and by the following: and by: visit us at pbs.org/masterpiece to watch video and explore features. and follow us on facebook and twitter. this program is available on dvd. to order, visit shoppbs.org, or call us at 1-800-play-pbs. captioned by media access group at wgbh access.wgbh.org happy 18th birthday. thank you, mr. mulgan, everyone. you're very kind. i'm sorry, but i actually have to go now. sorry. she's in a hurry to meet her fiancé, mr. mulgan. tommy! dave, come and have a look at this! we found brenda's body in the canal basin this morning. what? her body? you mean brenda's dead? green. all over me. water, choking me. cold at first, and then boiling. roaring and seething. cooling and clearing. the killing, ian, the killing. yeah, not real enough. you're suffering from paranoid delusions. you see assassins everywhere. some real, some not. death is breathing down your neck. so when you see that curtain move... yeah? what's this? stay there, dave. i wouldn't want you to bust ano