A Slip And A Trip — Gillian Larkin

A short murder mystery with ghosts.

Derek Quill is an elderly gent who can see the ghosts of murdered people. With the help of his ghostly friend, Pearl, he finds out who killed them.

Derek and Pearl meet Ryan Buckley, a young man who died when he apparently slipped in front of an oncoming bus. It's soon obvious that Ryan was murdered. Derek and Pearl speak to Ryan's family and friends. They find out that more than one person benefitted from Ryan's death. But who actually killed Ryan?