The Testimony of the Hanged Man (Inspector Ben Ross Mystery 5)

A hanged man would say anything to save his life. But what if his testimony is true? When Inspector Ben Ross is called to Newgate Prison by a man condemned to die by the hangman's noose he isn't expecting to give any credence to the man's testimony. But the account of a murder he witnessed over seventeen years ago is so believeable that Ben can't help wondering if what he's heard is true.