The Pest of Paternoster Row ( short story ) The Pest of Paternoster Row was a short story published in " Doctor Who The Official Annual 2016 " . Summary . In Paternoster Row , the Paternoster Gang ( Vastra , Jenny and Strax ) are confused by a strange scratching noise - until it takes the form of a Graske ! Synopsis . Vastra , along with the others , are all very confused by a scratching noise which seems to be coming from the walls . Strax suggests the total destruction of the entire property , however Vastra believes that ' s a little far fetched and instead suggests finding out what it is . Strax goes ahead with the suggestion - using his sonic lorgnette to examine the walls . Strax determines that there are definite signs of life form , describing it as a minature humanoid with tentacles attached to its head . He also finds snare - cable technology . Vastra immediately recognises the creature as a Graske , when a red outline appears on the wall in the shape of a large mouse hole . Vastra and Jenny take cover but Strax confronts the tiny beast , taunting it by saying its laser cannot harm him . The Graske instead runs directly to Strax and bites his right ankle . Strax shakes the Graske off , to which it runs back inside the hole and out of sight . Strax inspected the walls again , however there were no signs of the Graske any more . Jenny says cheerfully that now it ' s gone there is no need to worry and goes to prepare a pot of Earl Grey . That night , the Graske leaves its hiding spot and moves through the house and arrives at Vastra ' s bedroom . It stood at the end of the bed and aimed its snare - cable gun . However a voice warns the Graske about those actions - that voice was of Vastra . The Graske turns around and is met with the faces of the Paternoster Gang . Strax mocks the Graske ' s tactics , and tells it that it should surrender and prepare for interrogation and obliteration . However Jenny leaps between Strax and the Graske , telling them to let him go due to him only being small and harmless . Strax argues that there could be many more , to which Vastra agrees mentioning that they conquer worlds by swapping people with their own kind but disguised . Vastra adds that Jenny already knew that - to which Jenny ' s face scowls and her eyes glowed green . Jenny ' s body was engulfed in light and changed shape , into yet another Graske . Vastra grabs the ' Jenny ' Graske demmanding the whereabouts of Jenny . It replies that she ' s in limbo , and that there ' s no way back . Vastra doesn ' t believe the Graske , and orders Strax to deal with them . Strax lifts the snare - cable gun ( which he aquired from the Graske ) and fires at the Graskes . He yells in triumph as they disappear in a flash of bright light and a confused Jenny appears where they were . Vastra is concerned , but Jenny tells her not be worry so much in the Orchid House . Strax pours tea and tells her that she ' s even weaker than usual - and that she should drink her ' noxious leaf infusion ' and to not argue . Jenny asks them how they knew that Graske had taken her place , and asks whether it was her spotting the green eyes . Strax says that it would ' ve been too much of an obvious sign and instead believes that Vastra realised when she was ready to let the Graske run free through the streets of London . Vastra smiles , and says it was more obvious than that - and that it was actually when she offered to make the tea without being asked . References . " to be added " Notes . " to be added "