Martha Grimes: The End of the Pier (USA 1993)
From the Publisher:
In a sleepy resort town, Maud Chadwick waits tables at the Rainbow Cafe. Her confidant is Sheriff Sam DeGheyn and what they have in common is obsession. Maude doesn't want her son to leave home, and Sam cannot let go of the unsolved murders of three local women - or his intuition that the killer is still out there. How these lives intertwine reveals a rich and startling story of parents and children and the pain they cause one another.
Martha Grimes: The End of the Pier. Ballantine; ISBN: 0345376579 (April, 1993), 244 p., $6.99.