It’s easier to say what Jane Horrocks’s new musical dance-drama isn’t that what it is. Horrocks makes a short speech at the beginning and the end about the mysteries of love, as depicted in her selection of Mancunian heartbreakers from Gang of Four, Joy Division, Buzzcocks and The Smiths, among others. But there’s no narrative, as such, or individual characters, and the songs are only connected with a series of semi-abstract dance routines usually performed at the front of the stage, and often involving Horrocks herself.

Infidelity, hypocrisy, disillusionment, betrayal – and yet this is by far the lightest of French playwright Florian Zeller’s current London hat trick. Premiering in 2011, and thus sandwiched chronologically between the bleak pair of The Mother (2010) and The Father (2012), it takes a comparatively sunny approach to the fracturing of trust and deconstruction of the moral ideal of truth.

As settings for musical comedy go, this one promised some boom for your buck. Las Vegas in the early 1950s was just emerging as a magnet not only for hedonists and gamblers, mobsters and showgirls, but also for the personnel of America’s Atomic Energy Commission, engaged in fortnightly A-bomb tests over the Nevada desert.

Seldom can the suggestion of a post-show discussion have seemed so… well, unappealing is probably the polite way of putting it. Because discussion is precisely what Glasgow-based theatre company Vanishing Point’s devastating new show The Destroyed Room is all about – an hour of middle-class, liberal hand-wringing, of batting issues back and forth, weighing, challenging and rejecting opinions. And of showing up our delight at observing and our eagerness to express views, but also our inability to act on them.

Kaite O’Reilly’s new play is a dark dark comedy, a Chekhovian family saga on a mainly bare stage that handles its subjects of aging, death and family with a rich and grounded intellectualism to be expected of the playwright’s work. The production itself skips lightly along the thin line that separates reality from a discomfiting dreamscape, the waiting room: everyone is waiting, for death, for life, for family members to arrive. It is an ominous comedy.

Shorter feels longer in the West End iteration of Motown the Musical, a minor-league jukebox venture that became a Broadway hit courtesy of an unbeatable back catalogue – keep those hits coming! – and a well-drilled production that at least delivered what it promised on the tin. Despite trims for London, the production feels more attenuated and looks markedly less polished, even if there remains little doubt that people who go expecting to rock out to the world-class sequence of hits won't hesitate to do precisely that.  

Birdwatching is not the most thrilling subject for a drama. In fact, next to watching paint dry, it is probably the poorer option. So there is something wonderfully clever and theatrically brilliant about Robert Holman’s 1977 play, which takes place at a popular birdwatching spot overlooking the mouth of the Tees, a location around which several lives meet and connect. You can see why this 90-minute play won Holman the prestigious George Devine Award, and it’s great that it has finally been revived in an absorbing touring production by Alice Hamilton for Up in Arms theatre company.

An innocently-intended Friday night out turns into something fearsome indeed in I See You, a Royal Court co-production with the Market Theatre, Johannesburg, that puts the tensions of post-apartheid South Africa under a sorrowful microscope.

It’s often remarked that are no new stories, only old stories retold. The French playwright Jean Anouihl got the idea for his first play from a French newspaper report of 1919, about a young man who turned up on a railway platform with no knowledge of who he was or how he came to be there. In the wake of the story’s publication, hundreds of bereaved families came forward to claim the unknown soldier as their own.

Hurray, the two-part epic wizard-fest Harry Potter and the Cursed Child lands in the West End this summer, and its playwright is the ever-versatile Jack Thorne (who also successfully adapted the vampire romance Let the Right One In for the stage). But audiences who’d like to enjoy Thorne at his thorniest, rather than most Rowlingesque, might prefer to take a look at this, his 2015 two-hander about a couple and their loss of a child. It’s a Hogwarts-free zone and its main emotional fuel is horrific loss coupled with courageous honesty. Strictly for adults only.