Death Comes to Durham by Jeanne M. Dams

Dorothy and Alan are visiting a castle with a cop friend when disaster strikes.  A man at the nursing home has been killed and his aunt is the one accused of murder.  Suddenly, they are working on a case but they only have a week to do it...

Severn House and Net Galley allowed me to read this book for review (thank you).  It will be published July 2nd.

David's aunt has dementia so she can't even defend herself from the accusations.  Dorothy resolves to help.  She asks questions of everyone.  Her husband is a retired cop so he's against some of her theories because there is no evidence.  She realizes that and continues to try to find evidence.

Then an old woman at the nursing home was attacked with the aunt's decorative pillow.  David's aunt is being evicted.  Dorothy and Alan's investigations steps up a notch or two.  What they do find doesn't impress the cops.  But Dorothy is not giving up.

Then Dorothy is attacked by the killer and it takes four men to save her.  At least they have a  suspect but will they be able to charge him?