The Mystery of the Purple Pool (The Boxcar Children #38)
By Gertrude Warner.
Description
Henry, Jessie, Violet, and Benny used to live alone in a boxcar, now they have a home with their grandfather, and the are going on an exciting trip to NYC! They have a great time visiting the sights, but they discover something very strange in the hotel pool - someone has dyed the water bright purple! Who would do that? and Why? - from Amzon
ISBN(s)
0590469371, 9780590469371