Writing a crime series and keeping it fresh

Writing a crime series and keeping each novel fresh is always a challenge for crime writers. There are now fourteen in the DI Andy Horton series with
the latest, DEAD PASSAGE, published on the 18 October 2018 in
paperback, as an e book and on Amazon Kindle. All the DI Andy Horton
crime novels are set against the backdrop of the sea in Portsmouth and
on the Isle of Wight and in each novel Inspector Andy Horton and his
colleagues have a new murder mystery to solve.





Inspector Andy Horton was first introduced in TIDE OF DEATH, which
opens with his second day back in Portsmouth CID following an eight
month suspension on a charge of gross misconduct. Determined to prove
his innocence of the charges that have wrecked his career and his
marriage Horton finds his personal investigations sidelined when the
naked body of a man is found on the beach. Aided by Sergeant Barney
Cantelli, Horton sets out to find a killer who will stop at nothing to
cover his tracks. Since first appearing on the crime fiction scene in
TIDE OF DEATH in 2006, DI Andy Horton has gone through many trials and
tribulations in his personal life and solved many complex murder cases.
So how does a writer keep the series fresh and the central character of interest to readers?