On the day when our joint book comes out in paperback in North America, it is my great honour to announce that Emily’s new non-fiction book, Out of the Shadows, will be published by Counterpoint Press over there, most likely in summer 2020. And the North American audio rights have been acquired by Recorded Books, who also produced the audio version of A Secret Sisterhood.

In the midst of our celebrations, I reflect on our circular literary journey from a nervous first exchange of drafts to co-authoring and back again.

I first read Emily’s creative writing a decade and a half ago, when she was still in Japan (where we’d met as young English teachers) while I had returned to the UK and was living back with my parents in Birkenhead. The package of word-processed pages, which had wended their way from Emily’s shoebox apartment to my pink-walled childhood bedroom, lay unopened for days on end.

During my shifts front-of-house at a local cinema and in between protracted break-up conversations with my long-term boyfriend, my faraway friend’s unread work kept playing on my mind: what if I didn’t understand it, or couldn’t think of a response, or hated every word?

Part of me regretted our agreement to exchange writing samples. Although we’d been friends for two years, and had known about our shared dreams of publication for the past twelve months, I wondered whether our promise to read and give feedback on each other’s work had been too hasty. With my home, job and relationship all feeling temporary, I held onto writing and friends for stability. Both, I prayed, would remain in my life for the long haul. And yet, I dreaded receiving Emily’s feedback on my fledgling fiction. I wasn’t sure I had much to offer as a critic, either, and I was worried about the strain the discussion might place on us.

But as soon as I read Emily’s story – pen in hand and bolstered by pillows – I felt a sense of hope. The compelling narrative, enigmatic characters and captivating sensuality introduced me to a new side to my friend. I was brimming with ideas and comments and questions. For the first time in a while, I felt confident about the future: here was a friendship that could only be deepened by our daunting literary endeavours; here was someone I sensed would become my constant writing companion and confidante.

Neither of us could have predicted the extent to which we would walk alongside each other during our long, shared journeys to publication: postgraduate degrees in creative writing from the same programme; lecturing jobs at the same universities; thousands of draft pages covered in each other’s scrawl.

When we finally attended each other’s book launches or award ceremonies – having both by then accumulated stacks of rejection slips – the celebrations felt jointly earned. After all, we knew each other’s writing almost as well as our own, detecting behind each published page the ghostly presences of killed-off characters, discarded scenes and amputated lines.

Back when we first plucked up the courage to exchange our earliest drafts, we’d hardly dared dream of such intense collaboration, let alone the prospect of seeing our names published side-by-side. The first time we enjoyed this privilege was when we pitched a joint idea on female literary friendship to  The Times. And, of course, we would later experience the joy of seeing our names together on the cover of our co-authored book, A Secret Sisterhood: The literary friendships of Jane Austen, Charlotte Brontë, George Eliot and Virginia Woolf.

Writing together has brought us countless chances to share a creative process that is usually characterized by solitude. Instead, we’ve ferried bulging files of notes between each other’s homes; pored over forgotten manuscripts in far-flung archives; eaten fry-ups together after editing through the night; travelled across the USA on the Secret Sisterhood book tour, knowing that the friend we sat beside on stage was ready to pitch in whenever we needed help.

Even the inevitable difficulties of co-authorship have ultimately enhanced our friendship and our writing lives. We learnt, for instance, that we can get over fiery sleep-deprived arguments, that our literary disagreements invariably challenge us to come up with new and more robust ideas.

Our joint research for A Secret Sisterhood paved the way for each of our new books. I have become increasingly fascinated by another of Virginia Woolf’s female relationships – one that instilled in Woolf such fear and shame that she suppressed it from accounts of her life. Consigned to the footnotes of literary history, this woman will take centre stage in my novel based on her life.

Fiction writing marks a homecoming for me since my debut, Owl Song at Dawn, was a novel that explored Britain’s little-known history of learning disability through the lives of twin sisters born in Morecambe in 1933. Emily, however, will be deepening her practice as a writer of non-fiction.

During our Secret Sisterhood research trip to the New York Public Library, Emily transcribed a cache of letters from Harriet Beecher Stowe, the American author of Uncle Tom’s Cabin, to her British female friend George Eliot. Emily became fascinated by Stowe’s interest in Spiritualism – the belief that the living have the power to communicate with the dead.

Through this, Emily discovered a transatlantic community of Victorian women whose clairvoyant claims secured them unprecedented levels of power and celebrity.

Emily’s book proposal for Out of the Shadows introduced me to the mysterious world of seances, trance lecturers and former child mediums, who spoke up about female suffrage and draconian lunacy laws, delivered powerful political oration, advised Wall Street brokers, and even, in one case, stood as the first female presidential candidate of the United States.

I know that Emily has been spending hours on end in the library, and that her draft chapters are stacking up, but I have only caught glimpses so far of the stories they might contain. Soon, I hope, Emily will send them to me for feedback.

Fifteen years ago, when we first exchanged work, I felt almost paralyzed by the unknown territory contained in Emily’s word-processed pages. Now, I will pick up my pen straight away, curious to see where my friend’s research has taken her, impatient to read her words once more. On this journey back from co-authoring to writing separately, it is this renewed sense of mystery that I most relish – the opportunity to be taken somewhere entirely unexpected, led every step of the way by a trusted friend.

A Secret Sisterhood: The literary friendships of Jane Austen, Charlotte Brontë, George Eliot and Virginia Woolf is out in paperback in North America today.