Posted by Athena Scalzi
https://whatever.scalzi.com/2026/07/09/the-big-idea-bryan-gruley/
https://whatever.scalzi.com/?p=61518

“Innocent until proven guilty” isn’t always as black and white as it may seem in some cases. Author Bryan Gruley takes a look at what happens when other factors are at play in a seemingly open and shut case of murder. Plunge into the icy depths of the Big Idea for his newest novel, River Deep.
BRYAN GRULEY:
In the middle of a northern Michigan winter, a young mother drives into a river, drowning her twin infant boys.
My God. Why?
Was she drunk? Or drugged? Or both? Was she under intense stress? Was the father complicit? Did she have a reason, however misguided, to plunge into that freezing water? If she was at the steering wheel, is she guilty regardless of countervailing circumstances?
I didn’t know the answer to any of these questions when I put Catriona Dulaney into the Jako River outside little Bitterfrost, Michigan, at the start of my novel, River Deep. And I worried that, however my story answered those questions, Catriona would inevitably repel readers. After all, how can a normal person empathize with someone who is at least partially if not totally, maybe even intentionally, responsible for the deaths of helpless children? Why impose on readers the burden of relating to such a reprehensible character?
Catriona’s story was inspired, if that’s the word, by a 1989 case involving a man named DeLisle who drove his wife and four children into the Detroit River, drowning the kids. I was a reporter at The Detroit News in Washington, D.C., at the time, and read with great interest my colleagues’ stories about how DeLisle confessed to the crime and was sentenced to life in prison.
More than thirty years later, I revisited the case as I was conjuring an idea for a new novel. I read about DeLisle in Blood on the Mitten, an anthology of Michigan murders by Tom Carr, and did some additional digging of my own. Even after 2020, I learned, DeLisle was still appealing his conviction on grounds that his confession was coerced. He had previously struck me as a pathetic sort, unwilling to accept any responsibility for what happened. But as I read the appellate pleadings, I focused more and more on the motivations and behavior of the law-enforcement people who nudged the hapless DeLisle to the precipice. They professed to be seeking truth but acted more like they were stalking a guilty verdict. Maybe DeLisle, I thought, and by extension, Catriona Dulaney, weren’t the only bad guys in the story. I wondered whether such a character could be relatable and, just as important, compelling?
The answer, at least initially, was no. When I delivered a first draft of River Deep to Laurie Johnson, my editor at Severn House, I didn’t know that she, like Catriona, was the mother of twins. Laurie was, shall we say, highly sensitive to my portrayal of the woman standing trial for the murder of her sons, Liam and Logan. In her editorial comments, Laurie said Catriona’s outlook on her children’s deaths “comes across as cold. She doesn’t even seem numb … and so she runs the risk of losing sympathy with the reader. It’s crucial that we see some form of emotional journey from Cat, so that by the time of the court case, readers are invested in her–even if she admits she’s guilty.”
Laurie’s assertion resonated with me, though not right away. Initially I thought, if Catriona admits she’s guilty, the story is over, isn’t it? I was mistaken, but only after thousands of words in rewrite did I see how and why. What mother who lost two eight-month-old children wouldn’t feel somehow responsible, even if she wasn’t involved? Whether she is deemed guilty or not guilty by a jury of her peers, might not she nevertheless assume every tincture of blame she could soak up? As if a guilty verdict would be beside the point. And then, what reader couldn’t muster compassion for this mother and the shadow that will follow her to her grave?
I wrote through the entire novel with these questions and their possible answers in mind, dropping in details, dialogue, and a bit of back story that I hoped would close the emotional gap between Catriona and readers. I rewrote the last half-dozen chapters of the book and had both Catriona and Devyn confront the matter of Catriona’s relative guilt or innocence head on. Only readers can decide how well or even whether I succeeded, but when I finished, I was at peace with the character, even if she wasn’t entirely at peace with herself.
River Deep: Amazon|Barnes & Noble|Bookshop|Powell’s|Horizon Books (Bryan’s hometown bookstore; signed/personalized copies available)
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Read an excerpt: First Chapter of RIVER DEEP
https://whatever.scalzi.com/2026/07/09/the-big-idea-bryan-gruley/
https://whatever.scalzi.com/?p=61518