With a different author, or perhaps the same author with a different personality (and possibly a different editor) there would have been a way to tell the story completely truthfully (both facts and timeline) while engaging readers.
Open the book during the walk itself; two hapless, middle-aged "hikers", one has a number of baffling health issues. They are homeless, they're inept campers. Some chapters on the difficulties of the walk and wild camping, genuine descriptions of the landscape and encounters they have en route, some of which lead into the wider social topics of rural "holiday-isation" and homelessness. Honesty about being short of money, theft from shops and blagging campsites. Reflections on how the weeks of walking are changing them, and their perspective on their lives. Ruminations on why the health issues have abated.
Circle back to their being homeless. Why? Because of a court case. But why a court case? Deep breath - in 2008 this is what I did...full confession, and full disclosure on the author's faults and flaws, how she explains it to herself now (in 2013) and how the family moved on. Then, back to the walk: much better health, is it connected to the walking? A tentative plan of what to do next, offered a flat to live in, begin to put lives back together again. Conclusions on what was learnt on the walk, on redemption, learning to live with oneself etc. Then, a diagnosis from a neurologist, "atypical CBS". Not as bad as it could be, still shattering news, what does it mean for the newly-established precarious future? How long is that future going to be? To be explored in a second book.
Losing everything is something millions fear, or have experience of, as is chronic or terminal illness. Engaging readers in the story of the walk first, building that connection before dropping the bombshell of "actually, I did a horrendous thing" means they will at least read on. And if the writer is honest and truly contrite, the whole story gives readers new insights and things to think hard about, and will resonate
We'll never know if Penguin would have commissioned such a book of course. And, like I said, it probably requires a different (type of) writer to write it.