Poison

You, Paula and Peter are dropped off outside Pit Viper's lair by Amelia, who will go no further. She wins, even if you can't make a deal, as she'll have delivered some of Pit Viper's targets.

As you descend into Highgate Station, Paula and Peter discuss what might be living down there. Jody directs you using Amelia's fairly accurate maps, but that doesn't stop zombies chasing after you.

Everyone comments on what a good job Pit Viper's interior decorating skills are doing of putting people off visiting! Suddenly a train comes loose and is heading towards you!

You narrowly escape the runaway train by climbing onto a ledge. There are more moans nearby, but it's not zoms; it's a group of city commuters armed with iPad shards dipped in flesh-eating bacteria.

Murderous commuters evaded, Jody discusses Amelia's, slightly more vague, notes. Peter notices the shadows of some headless, indestructible zoms, so you move on quickly.

After running for a while, it turns out the zombies are actually attached to a remote controlled wagon. Suddenly a guard appears: you've passed the final test and can see Pit Viper.

Paula remarks on how well appointed, and secure, this place is. Pit Viper sits behind a desk wearing a mask as you enter the office, then removes the mask to reveal... Janine!