I Let You Go by Clare Mackintosh

I Let You Go by Clare Mackintosh is a twisty-turny tension-filled debut novel. It opens with DI Ray Stevens and his new partner Kate Evans interviewing a mother whose 5 year old son has slipped from her grasp on the way home from school and is killed by a hit and run driver.  Of course the police are determined to find who would be so despicable as to leave a child dying in the street.
Unable to face the devastating accident, Jenna Gray runs away and hides out in the small coastal village of Penfach where the police and press can't find her. She slowly settles in the village, making friends with the owner of the caravan park and with the owner of the tiny cottage she rents.  Previously she was a sculptor, here she begins to take photographs of the beach and sells them as postcards.  She finds a half dead puppy and forms a romantic friendship with the local veterinarian.  She is beginning to put her past behind her and feel hopeful about the future.  Then it all comes crashing down around her when the police find her and arrest her.
This is Part One of the book.  Part Two begins with Jenna meeting her husband and fills in the backstory to the time of the arrest and after.  There are so many twists, that revealing any more of Part Two would give away too many of the surprises.