The third Inspector Hornleigh film is not up the standards of the previous two films, partly as it is now set in wartime and involves fifth columnists rather than being a straightforward mystery. The early part where Hornleigh and Sergeant Bingham go undercover in the army is dull but once the first murder occurs it picks up steam until the mail train climax. The humour is still there but story is not as gripping as the first two films.Harker and Sim do enact Hornleigh and Bingham like seasoned performers and play off each other peerlessly. Phyllis Calvert and Edward Chapman are wasted but reliable players like Raymond Huntley, Wally Patch,Betty Jardine and Bill Shine are effortlessly watchable. The great Cyril Cusack plays an early role as a postal worker.There is a framing device to the film in which Inspector Hornleigh dictates his memoirs to Sergeant Bingham which gives a feeling of rounding of this series of films. It's a shame there were no more done.

Let me join other reviewers in praising this fast-paced and witty thriller featuring strong characters. Scotland Yard, rather than a hive of ruthless efficiency, is populated by posturing egomaniacs, yet Gordon Harker and Alastair Sim get their man (and his very glamorous sidekick) in the end. While their time in the Army may drag a bit nowadays, then it was part of the nation's collective experience and a suitable case for affectionate satire. Once our pair are on the trail of the spies, things move faster and the other settings of creepy dentist's house, eccentric boarding school, country hotel and final mail train are all well evoked. Enjoyable double entendre abounds whenever Sim encounters a good-looking woman. My favourite is Phyllis Calvert as the dentist's apparent widow, who promises him she will hide nothing as she takes off her cloak and puts her décolletage under his nose. When shortly after that she disappears with the contents of the murdered dentist's safe, it is handy for her that Sim had previously disabled the alarm.So many characters to applaud that I'll just give a special mention to Raymond Huntly for relentless sneering as principal villain: it takes a real professional to keep it up.

The third and final film in the series, "Inspector Hornleigh Goes To It" (trade shown 4 March 1941 and generally released in the U.K. on 5 May 1941) is often described as not quite up to the standard of "On Holiday", but I thought it equally entertaining. True, the plot tends to side-step its noirish elements to concentrate on thrills rather than shivers, and Alastair Sim fans will be unhappy their hero doesn't figure in the great mail train climax (which starts with a flourish but actually finishes up rather lamely); but the support players, led by the lovely Phyllis Calvert in an unusual role as the heavy (which she handles with amazing skill) and the ever-reliable Raymond Huntley (whose suavity masks a heart of ice) more than make up for these little disappointments. It's also good to see competent character impersonators like Betty Jardine (Sims' girl), Percy Walsh (the crowing Blow), O. B. Clarence (the candidate Harker leans on), Bill Shine (the school porter who partners Harker in a delightful exchange), and Edward Chapman (an insistent patient who fastens himself on Sim) in such well-written roles that do full justice to their talents. The movie was again most skilfully directed by Walter Forde who made the most of both the comic and suspense elements in the Val Guest/Major "Joc" Orton screenplay (based on an original story by Frank Launder). For its American release, 20th Century-Fox altered the title to "Mail Train", an inappropriate change because the mail train only figures at the climax (and, as said, somewhat disappointingly brief the sequence is too).

Having never seen the other 'Inspector Hornleigh' flicks I was unsure what to expect here, which sure made it all the more exciting. Harker was splendid as the droll Hornleigh but definite kudos go to Sim, his side-kick Bingham, who blunders his way through to heroics each time. The plot is your average war-spy-drama - who is sending the secret code to the Germans and how are they doing it? - but this is easily one of the better of the genre. It was also fascinating to see sweet little Phyllis Calvert playing an out-and-out bad girl. It's a shame she didn't get to play more of the same type of role!