The Matters at Mansfield by Carrie Bebris.
This is a Mr and Mrs Darcy mystery.So three guesses which Mr and Mrs Darcy? Yes that's right this follows the life of Colin Firth and Jennifer Ehle, oh silly me I mean ,Elizabeth (nee Bennet)and her husband Fitzwilliam Darcy.
The author manages to incorporate characters from Pride and Prejudice and Sense and Sensibility.
At this stage in their married life Elizabeth and Darcy are happy in their state with a lovely baby , namely Lily-Anne. Lady Catherine de Bourgh is recovering from Darcy's decision to marry Elizabeth instead of her daughter and so must find a suitable suitor for Anne.
Whilst Lady Catherine is preoccupied with this task Anne elopes with a mysterious man. Lady Catherine calls on her nephew, Darcy and his wife to help trace the couple. As Anne and her man flee to Gretna Green to wed their happiness is soon destroyed as Anne's husband is named as a bigomist and as if this is not enough trouble, a murder is committed and Anne's 'husband' disappears. All this fuels Lady Catherine's temper!
To solve the murder and mystery Elizabeth and Darcy must use all their powers of deduction and their ability to use a pistol.
This is the first 'Darcy mystery' I have read, in fact the first book by this author and it was sheer delight to read. Incorporating a great mystery and humorous in places it brought the characters from the Jane Austen books truly alive. I highly recommend it.