A rather silly British comedy-mystery that takes place in an old mansion & an adjoining monastery which is supposedly haunted by the Black Abbot. There is too much talk (often in the form of isolated, stagy vignettes, & too little plot. Some of the smaller roles are juicier than the major roles. For example, the parts of Aunt Mary (played by Drusilla Wills) & the maid (played by an unknown actress who keeps wiping her nose) are well done.