Elly is the best-selling author of the Dr Ruth Galloway Mysteries, all set in Norfolk, and the Stephens and Mephisto books.
The sell-out speaker at the last Deepings Literary Festival in 2019 will be helping preparations for next year's event, which is supported by South Kesteven District Council, and is due to take place from 28 April to 2 May.
Elly said: "I'm honoured to be a patron of the Deepings Literary Festival. This a fabulous community event that brings together some of the biggest literary names alongside lesser-known and upcoming authors. There's a really friendly, inclusive feel to it - and cake is usually on offer! I can't wait to take part in the festival again."
Elly's books have been shortlisted for the Theakston Old Peculier Crime Novel of the Year three times and, in 2016, she was awarded the CWA Dagger in the Library for her body of work. The tenth Ruth Galloway book, The Dark Angel, was published in February 2018 and was a Sunday Times bestseller. Elly's first stand-alone, The Stranger Diaries, was published in November 2018 and awarded The Times Crime Book of the Year.
She has also been long-listed for this year's prestigious CWA Gold Dagger award, honouring the very best in crime writing, for The Lantern Men.
Festival originator and South Kesteven District Councill, Judy Stevens said: "We are absolutely delighted to have someone of Elly's literary calibre as our patron. She fits perfectly with the profile of our event and will help to further establish the festival's literary credentials.
"Elly was very popular when she spoke at our last festival. Her books are best sellers and she will bring huge benefits to the Deepings Literary Festival."