Virginia Woolf remains one of the most widely read and celebrated writers of the 20th century, with To the Lighthouse and Mrs Dalloway regularly appearing near the top of lists of the greatest novels of all time. Yet not all of her books are so well remembered.Woolf’s second novel, Night and Day, published in 1919, is often seen as an anomaly. Unlike her more famous books, it has a realist, almost Victorian style and a slow, languorous plot. Perhaps unsurprisingly, it is one of the least read of Woolf’s works (compare the 366,000 Goodreads ratings for Mrs Dalloway to the 10,000 for Night and Day).What is surprising is that it has just been adapted for the big screen – the first major adaptation of any Woolf novel in decades. Night and Day is set around 1911 and focuses on the complicated love lives of four young Londoners. The novel follows Katharine Hilbery, who lives in the shadow of her famous poet grandfather and secretly longs to be a mathematician (a profession closed to her due to her gender). It also introduces William Rodney, her fiance, a pretentious government official and aspiring literary critic, and Ralph Denham, a lower-middle-class lawyer also in love with Katharine but who can’t bring himself to tell her directly. And finally, Mary Datchet, a suffrage campaigner who feels an affection for Ralph that deepens over the course of the novel. On its publication, it received a shaky reception. Novelist and fellow Bloomsbury Group member E.M. Forster told Woolf that he hadn’t enjoyed it as much as her first novel. While the short story writer, Katherine Mansfield, whom Woolf knew personally, damned it publicly in a review. Mansfield criticised it for focusing on a pre-first world war society that no longer existed by 1919. While other writers were addressing the momentous social changes ushered in by the conflict, Woolf seemed “unaware of what has been happening”. In a back-handed compliment that Woolf recorded in her diary as being particularly stinging, Mansfield dismissed the novel as merely being “[Jane] Austen up-to-date”.It is a critical assessment that has largely persisted. The novel lacks the experimental free indirect discourse of Woolf’s later modernist novels, which blend third-person narration with the first-person perspective of their characters. This has been taken as evidence that Woolf had not yet found her own distinct voice as a writer. As Mary Wilson outlined in an issue of the academic journal the Virginia Woolf Miscellany, dedicated to the novel’s centenary, even Woolf scholars have found the book divisive and its artistic merit in need of critical justification.All of this, however, overlooks the way in which Night and Day is a far more provocative and captivating novel than is commonly assumed. Here are three reasons why it is ripe for rediscovery.1. Woolf’s unique take on suffrageNight and Day was written in the years leading up to women winning the vote and is one of Woolf’s few depictions of the campaign for female enfranchisement. Yet, despite Woolf’s avowed feminism, the book does not straightforwardly endorse the suffrage movement.An example of what the literary scholar Clara Jones has shown was Woolf’s ambivalent relationship to activism, the scenes set in the suffrage campaign offices show the movement as prone to political squabbling, petty mindedness and, even, male power grabs. For anyone looking to better understand Woolf’s later controversial claim in A Room of One’s Own that economic independence is more important than enfranchisement for female liberation, Night and Day is a great place to start.2. Woolf’s interest in the human as animalIn one of the novel’s most memorable scenes, Katharine, her cousin Cassandra, William and Ralph go on a kind of double date to London Zoo. In a moment of comic disorientation in the Monkey House, Katharine suddenly sees William as nothing more than a clothed ape; an animal desperately trying (and failing) to be civilised. Woolf was deeply interested in evolutionary biology. No doubt influenced by events in Europe between 1914 and 1918, throughout Night and Day we see Woolf repeatedly implying that civilisation is just a thin veneer concealing a primitive animal reality. If this is Austen up-to-date, as Mansfield suggested in her review, then its equivalents of Miss Bennet and Mr Darcy in Pride and Prejudice resemble upright apes whose humanity might fall away at any given moment.3. Woolf’s subtle queering of sexualityIn addition to Katharine’s love triangle with William and Ralph, the novel also presents an unspoken attraction between Katharine and Mary, allowing Woolf to push beyond the heteronormativity of the period. In the most suggestive scene, Mary touches the “hem of Katharine’s skirt” as the two sit alone and “fingering a line of fur” compliments her on her clothes. Like so much of Night and Day, it is a moment where meaning is left implicit and unsaid, and yet the sometimes tender, sometimes terse intimacy between Mary and Katharine offers an early example of Woolf’s queer sensibilities and a fictional precursor to her later lesbian affair with Vita Sackville-West.Towards the end of her life, Woolf would look back on Night and Day and disavow it as a “complete failure”, a view that readers and critics have tended to share. Yet, with director Tina Gharavi’s film about to open, my hope is that the book will find a new generation of readers more willing to see it for the quietly subversive and defiant novel that it is.This article features references to books that have been included for editorial reasons, and may contain links to bookshop.org. If you click on one of the links and go on to buy something, The Conversation UK may earn a commission.Peter Adkins does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.