When the safety of the ancient Gyrth Chalice is threatened, Campion embarks on a dangerous assignment to protect it. He soon discovers that his adversary will stop at nothing - even murder - in order to get the Chalice.
| Name | Type | Role | |
|---|---|---|---|
| Margery Allingham (author) | Writer | ||
| Alan Plater | Writer | ||
| Martyn Friend | Director |