The landlady

 The landlady is realistic fiction, suspense and a mystery story.

suspense;
“Oh, it’s the perfect age! Mr Mulholland was also seventeen. But I think he was a trifle shorter than you are, in fact I’m sure he was, and his teeth weren’t quite so white. You have the most beautiful teeth, MrWeaver, did you know that?”
This is a suspense quote because her knowing Weaver that much info how he looked how white his teeth how old he is while he is dead gets you on the edge of your seat
"His skin was just like a baby's"
This is a suspense quote because it gets you on the edge of your seat because we don't know why.
Realistic fiction;

Billy Weaver had travelled down from London on the slow afternoon train, with a change at Swindon on the way, and by the time he got to Bath it was about nine o’clock in the evening and the moon was coming up out of a clear starry sky over the houses opposite the station entrance. 
This is a realistic fiction a because London is a real place and Billy might be a real person and realistic fiction stories are mostly about places and people that are realistic.

Suddenly, in a downstairs window that was brilliantly illuminated by a street-lamp not six yards away, Billy caught sight of a printed notice propped up against the glass in one of the upper panes. 
This is realistic because in London their must be a plas like this where people come eat and sleep.

Mystery;
“You know something?” Billy said. ‘Something that’s really quite extraordinary about all this?”

This is a mystery because Billy's now trying to find out what the lady did, he is investigating.
“That parrot,” he said at last. “You know something?

 This is a mystery quote because Billy is trying to investigate.

This quotes indicate that this story is a mystery,realistic fiction and suspense story.