Brainstorm

Setting Ideas -

Hotel (rooms and corridor)
Lakes eg punting area, wimpole hall
House/garden
SuperMarket
Shopping Center
in the street
bedroom
bathroom/toilet
kitchen

Plot Ideas -

stalking
kidnapped
detective looking over dead body
missing- newsreporting on scene,view crime scene etc
'test a myth'- people trying to find out if a horrible event actually happened and end up in trouble
threat letters
whitness- someone wants revenge on them