The Girl on the Train by Paula Hawkins [retail epub]

Epub, retail quality.

From Amazon:

Three women, three men, connected through marriage or infidelity. Each is to blame for something. But only one is a killer in this nail-biting, stealthy psychological thriller about human frailty and obsession.

Just what goes on in the houses you pass by every day?

Rachel takes the same commuter train every morning and evening, rattling over the same junctions, flashing past the same townhouses.The train stops at the same signal every day, and she sees the same couple, breakfasting on their roof terrace. Jason and Jess, as she calls them, seem so happy. Then one day Rachel sees someone new in their garden. Soon after, Rachel sees the woman she calls Jess on the news. Jess has disappeared.

Through the ensuing police investigation, Rachel is drawn deeper into the lives of the couple she learns are really Megan and Scott Hipwell. As she befriends Scott, Rachel pieces together what really happened the day Megan disappeared. But when Megan's body is found, Rachel finds herself the chief suspect in the case. Plunged into a world of betrayals, secrets and deceptions, Rachel must confront the facts about her own past and her own failed marriage.

A sinister and twisting story that will keep you guessing at every turn, The Girl on the Train is a high-speed chase for the truth.