How many books can, or should, you write at the same time? When Efi Efitall started writing her novel, she found that when she was about 45,000 words into it, that she had so much backstory she needed a whole other novel to do that. And then when she was working on that novel, she realized she needed another one to make everything tie together nicely. So she ended up writing three novels at the same time.
She explains how it all came to be and how it turned out.