Seven guests, a newly hired secretary and two staff are gathered at a manor house on an isolated island by an unknown absentee host and are killed off one-by-one. They work together to determine who the killer is before it's too late.
Ten people are invited to a hotel in the Iranian desert, only to find that an unseen person is killing them one by one. Could one of them be the killer?
In the sixteenth century, Francis Barnard travels to Spain to clarify the strange circumstances of his sister's death after she had married the son of a cruel Spanish Inquisitor.