Mr Hall, chief executive at Yellowtail Financial Planning, said he dealt with many widows in his practice and felt there was an opportunity to share knowledge.
The new book, titled 'Who will it hurt when I die?', is due to be launched on 31 October.
He said the main problem was that people felt unprepared to deal with the finances after a bereavement and he felt people needed to prepare beforehand.
It was important to prepare, he said, in order to anticipate and solve any problems before they become an issue and it is too late to do anything.
He said: "The biggest thing I've found is how little anyone talks about it. People are just cruising into problems because they don't want to talk about it.
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"In the post-bereavement stage they then feel embarrassed and have no confidence in money. We need to coach people to feel good about it."
He said when widows came to his practice, the first part of the relationship was spent sorting out problems because they hadn't done anything since the bereavement.
The target audience for the book is people in their early 50s who were starting to think about what might happen in their later life. However, he acknowledged bereavement could happen at any age and the facts were just as applicable for people in their 30s or in their 70s.
Mr Hall is a former winner of the Institute of Financial Planning Tony Sellon 'Good Egg' award for his work to promote Financial Planning and is on the IFP Annual Conference committee. 

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