Flashback

Cassandra is 21 years old and works as a estate agent showing her clients around new on the market dream homes.
She never knew her parents they left her at grandma house on the door step with a note attached saying "Please look after her."
What will happen when she inherits her grandma house, who are the new neighbors three men next door and why do they keep watching her in a creepy way.
what exactly did my grandmother mysteriously leave in this house?