Ben's book documents the often contradictory experiences the past year has brought him and Jackson. As well as a testament of his grief, it is also a story of love and a tribute to the son who has brought Ben so much happiness.
It was one such moment that gave rise to the title of Ben's book.
On a day when Ben was 'sad to the point of absolute misery,' and the weather was equally miserable, he said to Jackson: "Put your hood up it's raining outside."
"It's not raining, Daddy, it's happy!" Jackson replied, snapping Ben out of his gloom in an instant.
It's not Raining Daddy, It's Happy by Benjamin Brooks-Dutton (Hodder & Stoughton) is available in Hardback and eBook editions from May 8 2014.