Beyond Recall by Robert Goddard
Estranged from his family for most of his adult life, Chris Napier is persuaded to return home for his niece's wedding. At the reception, he is shocked to recognise a dishevelled intruder as his childhood friend Nicky Lanyon, whose presence is a chilling reminder of a murder and subsequent trial that Chris has tried hard to forget. When Nicky hangs himself, Chris is compelled to revisit the tragic events of 34 years ago, and the apparent justice that was served. But as present day mysteries begin to shadow his footsteps into the past, his search for the truth soon becomes a desperate struggle for his own survival.