First published in 1958 and first issued by Fontana Books in 1961. There were further impressions made in 1963, 64 and 66. This copy is the fifth impression, published March 1967.
Jacko Argyle died in a prison hospital while serving a life sentence for the murder of his mother.
Two years later a stranger shattered the peace of the Argyle household. Could Arthur Calgary provide the missing link in Jacko's defense? Had Jacko been sentenced for a murder he didn't commit?
Arthur expected delight, relief and joy in the family, but he instead he found that the Argyles were suspicious, stubbornly evasive and frightened. An unspoken question huny oppressively in the air: if Jacko didn't kill his mother - who did?