Two authors writing as one takes quite some discipline. The advantages of having two minds working at the story is that it drives the narrative forward, stimulates an element of friendly competition and also means that there is always someone there to encourage or chase to make things happen. However, there are pitfalls too: the competition and drive need to be kept in check lest they snowball and get out of hand, no one wants to read something terribly exciting but completely preposterous!
One thing that we paid special attention to was the clustering of plot elements and timelines; too little in one then jumping to another can create a fractured, flitting story. Being conscious of this will allow the story to flow more smoothly, and spend enough time in each area or scene before moving on. Working at a distance in different timezones poses its own challenges as many of you will know, so it is important to keep in touch regularly and to talk developments over. And when you do talk things over, be honest. If you’re embarking on a dual-author adventure, we hope these few words will come in useful.