| ORIENTEXPRESS | Where Poirot investigates the murder of Samuel Ratchett (6,7) |
| FIVELITTLEPIGS | Agatha Christie novel (1942), in which Hercule Poirot investigates the murder of artist Amyas Crale, published in the US as Murder in Retrospect (4,6,4) |
| EROTEMESEBOTT | Where Poirot scoffed, arrant curates struggled |
| RESTAURANTCAR | Where Poirot scoffed, arrant curates struggled |
| NILE | Where Poirot cruises on a steamer |
| FINEMESSYOUVE | see 16ac, Name given to the murder of Ernst Rehm and others by the SS on Hitler's orders (5,2,3,4,6) |
| PETRIE | In 1891-92, this pioneering Egyptologist investigates the Great Temple of the Aten at Amarna. |
| CORONER | One investigates the method of passing oxygen in tight spot (7) |
| CAB | Government body which investigates the assets of alleged criminals (3) |
| IROBOT | Movie in which Will Smith investigates the death of an AI mogul |
| WARREN | Chairman of the 1963 commission set up to investigate the death of US President John F Kennedy |
| WARRENREPORT | The official document produced by the commission established to investigate the assassination of President John F. Kennedy (6,6) |
| GONE | ___ Tomorrow 2009 novel by Lee Child in which Jack Reacher investigates the death of Susan Mark |
| PROBES | Investigates The Last Word over cover-up (6) |
| DIGS | Investigates the boarding-house (4) |
| VOYAGER | Carrying the Golden Record intended as a greeting to extraterrestrial life should it be encountered, either of two space probes launched in 1977 to investigate the outer planets (7) |
| CORTES | Spanish conquistador sent by Velazquez to investigate the wealthy realm of the Aztecs (6) |
| RESEARCHBODEREK | Investigate the star of '10' |
| PROBEREINER | Investigate the director of "Stand by Me"? |
| PROBE | At leaving a trial of will to investigate the wound (5) |
