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.

“Murder is hilarious,” quips Zawe Ashton’s scheming maid, and in Jamie Lloyd’s high-octane, queasily comic revival of Jean Genet’s radical 1947 play, it really is. It’s also lurid, strange, bleak and powerfully transcendent, as befits a piece that locates hunger for creation and liberation in the imitation and destruction of another.

A prevailing sense of farewell ripples through this closing production in the Sam Wanamaker Playhouse's hugely welcome season of Shakespeare's final quartet of plays. That valedictory feel is traditionally true of The Tempest, a text commonly regarded as Shakespeare's own leave-taking and one that here also marks the final staging after a decade at the helm of the venue's sure-to-be-missed artistic director Dominic Dromgoole, who now hands over the reins to Emma Rice.

Shakespeare’s plays have proved remarkably resilient to everything that’s been thrown at them down the years, including – in the case of A Midsummer Night’s Dream, with its flowery bowers and fairies – cloying Victorian whimsy. Peter Brook’s white box production in 1970 effectively Tippexed out that option for the late 20th century. In turn, this version by the touring company Filter has put down a marker for the 21st.

Theatregoers suffering from First World War fatigue may want to pass on Jonathan Lynn’s merely competent historical drama about two mythic figures: Charles de Gaulle and Philippe Pétain. It’s a fascinating subject – de Gaulle had his former mentor tried for treason in 1945 after Pétain led France into Nazi collaboration – but Yes Minister co-creator Lynn, who also directs, seems unsure whether it warrants winking satire or solemn historical re-enactment, settling for a fitfully engaging hybrid.

Alan Mahon’s Hamlet in Andrew Hilton’s production for Shakespeare at the Tobacco Factory bristles with teen spirit and this is no bad thing. The Prince of Denmark, even before his father dies, is beset with the angst that goes with the territory of late adolescence. The production presents, on one level, a tragic coming of age drama, one in which the young heroes are consumed by madness and caught in the political and sexual machinations of their elders.

Although everyone agrees that Sarah Kane was one of the most influential British playwrights of the 1990s, revivals of her work have been few and far between. Now, at last, some 17 years after her suicide at the age of 28 in 1999, our flagship National Theatre has finally decided to stage one of her best works (artistic director Rufus Norris, thank you). But although she became infamous for the media-fuelled scandal and atrocity-fest aspects of her work, subsequent reconsideration suggests that her main theme was nothing less than romantic love.

Given that Edmond Rostand’s 1897 tragicomic verse play Cyrano de Bergerac gave the word "panache" to the English language, it’s an irony that panache is the quality most woefully lacking in Russell Bolam’s production of Glyn Maxwell’s adaptation. It ought not to be so. With its all-female cast and stripped-down staging, it ought to feel radical and fresh, stimulating new lines of enquiry into the nature of role-play and what constitutes maleness and male heroism, shedding new light on a familiar text.