Belinda's ex-best friend
On the run.
Imogen has known Belinda for years. They were close friends, but Imogen was nowhere near as good with money as Belinda. When Imogen’s business failed and relationships fell apart Belinda offered her a place to stay. A couple of months later Belinda’s husband (with whom Imogen had been having an affair) poisoned Belinda so that he and Imogen could “start a new life”.
Now she’s out there somewhere, Belinda might yet find her.