[2] Robinson wrote a short story Innocence in 1990, about Terry Reed who was accused then cleared of the murder of a schoolgirl.

Robinson next wrote an entire novel from Reed's point of view, which was turned down by his publisher.

When the story was adapted for television, it was heavily edited and was noted for not bearing much resemblance to the original book.

For example, the murder victim was now known as Ellie Clayton; Ellie was last seen leaving her local theatre group, rather than her school; her body was found at a popular beauty spot at Valley's Edge, rather that in the local cemetery; Ellie's father is an internet entrepreneur, rather than an industrialist; and the suspects are her father's business partner, her father, her on-off one-man crime spree boyfriend; and her theatre tutor; rather than a vicar, his wife, or an ex-girlfriend of the accused.

A German translation by Andree Heese was published by Ullstein in 2004 under the title Der unschuldige Engel.