Enola Holmes 3sees Philip Barantini (Adolescence) take over direction from Fleabag’s Harry Bradbeer while Jack Thorne (another Adolescence alum) continues as writer from the first two films. The supposed darker take is not very apparent in this tale featuring the consultant detective’s sister.

Based on Nancy Springer’s charming The Enola Holmes Mysteries, Enola Holmes 3 opens with a wedding in Malta. Enola (Millie Bobby Brown), the younger sister of Sherlock (Henry Cavill), and a detective in her own right, as we have seen from the earlier films, is getting married to sweet, idealistic Lord Tewkesbury (Louis Partridge).

Sherlock is in Malta for the wedding which he strongly disapproves, believing Enola will not be able to pursue her career as a detective once she marries and becomes Lady Tewkesbury. Enola has her own doubts about the marriage — not about Tewkesbury but about his world, the people in it and their expectations.

When she finally gets into the carriage for her wedding, she realises she is being followed by a masked rider. After a thrilling chase involving the dropping of many bridal veils, the pursuer is revealed to be Dr Watson (Himesh Patel), Sherlock’s flatmate, friend and chronicler (not yet, though). The mask, the good doctor explains, is for allergies.

He was thundering after Enola because Sherlock has vanished, probably kidnapped, as he was working on another case. When Enola’s future mother-in-law, Lady Tewkesbury (Hattie Morahan) also goes missing, the wedding is forgotten as Enola races against time to solve the mystery.

The pieces of the puzzle include the Battle of Khost in Afghanistan, looted gold, the Maltese fight for independence in the person of Mikiel Mizzi (Joe Azzopardi) from the Partito Anti-Riformista, and the criminal mastermind Moriarty (Sharon Duncan-Brewster).

Enola’s mother, Eudoria (Helena Bonham Carter) and her friend Edith (Susan Wokoma) are skulking around giving Enola invisible support as Eudoria is in trouble with the law for her dynamite-forward ways.

Enola Holmes 3 zips by in a series of frantic action sequences, quips and callbacks. The storybook look is propped up by those amazing pop-ups. Darker themes arrive in lines such as Moriarty saying “There are few British names that are not tarnished with the pain of its empire.”

Brown has created an endearing heroine in her Enola, even if her habit of breaking the fourth wall, while definitely reduced, has gone way beyond twee to be outright annoying. Cavill’s Sherlock is brave and beautiful and just that little bit cross, while Carter’s Eudoria walks the line between gently eccentric and decidedly odd as she dispenses gems of wisdom including “the puzzle is always as devious as the setter.”

Fast, fun and eminently forgettable, this is popcorn entertainment at its most efficient.

 Enola Holmes 3 is currently streaming on Netflix