Annie unwittingly opens the door to the railway detective, who returns to Jericho with a secret he could expose that could ruin everything. Ralph, is ready to go to extreme lengths to stop him. Charles holds a Whitsun fair. Isabella has a idea on how to save the viaduct.

The town soon find out who Johnny really is and this leaves him isolated. Coates and Annie even keep their distance. Charles faces up to the prospect of financial ruin and realises he has to approach Jonas as a way of staying alive. Annie gets embroiled with Jonas and soon realises what his true plan is, leaving her in a dangerous situation that only Johnny may be able to help her out of.