Rachel sees the same couple breakfasting on their deck each morning as she passes by in her commuter train. She thinks their life looks perfect until, one day, she sees something shocking. The train moves on immediately, but she can't keep it to herself and informs the police. Has she done more harm than good?

"The author of the #1 New York Times bestseller and global phenomenon The Girl on the Train returns with Into the Water, her addictive new novel of psychological suspense. A single mother turns up dead at the bottom of the river that runs through town. Earlier in the summer, a vulnerable teenage girl met the same fate. They are not the first women lost to these dark waters, but their deaths disturb the river and its history, dredging up secrets long...