The Two Tickets Puzzle

Superintendent Ross Mystery series #2

When Oswald F. Preston is shot dead on the 10.35 local train from Horston, two obvious suspects are immediately in the frame: his wife's lover and an employer with a grudge. With red herrings a-plenty, and a number of other contenders for murderer, including a young heiress, Superintendant Ross has his work cut out for him.
This is a classic "fair play" mystery that will be enjoyed by every reader who wants to pit their wits against the detective.

- from fictiondb.com