Night Train to Paris by Fliss Chester

Meet Fen Churche, as she steps off the night train with the sun rising over Paris. Cat whisperer, crossword puzzler… accidental detective?

Autumn, 1945. Fen cannot wait to see her beloved godmother Rose, who has invited Fen to stay with her in the city of lights. As she arrives, Fen is dreaming of strolls by the Seine, taking tea at the Eiffel Tower and above all French feasts with Rose where they can trade stories of how they survived the terrifying war years.
But Fen has barely made friends with Rose’s bad-tempered poodle when she returns to the apartment to find her godmother murdered, a paintbrush stuck in her neck. Suddenly Fen is thrown into the middle of a truly puzzling mystery. Who on earth would want to murder Rose, a gentle artist and generous friend?
A blackmail letter convinces Fen that the police have got everything wrong and Fen knows she has to solve the case just like one of her crosswords, one clue at a time. As she meets her godmother’s friends, she makes a surprising discovery: Rose was part of the Resistance during the war…
When a second body turns up, another of Rose’s wartime contacts, Fen must act fast. But as the killer turns their sights on Fen, does she have what it takes to solve this mysterious murder and get justice for her darling godmother?
You won’t be able to put down this utterly addictive historical cozy mystery! The absolutely perfect treat if you love Agatha Christie, Rhys Bowen and Jacqueline Winspear.