Win by Harlan Coben.
I believe this is the first book in a new series which is a spinoff from the Myron Bolitar novels he’s famous for. Windsor “Win” Horne Lockwood III (a billionaire, if you couldn’t tell by the name) has been a sidekick to Myron in many of the previous books but takes centre stage in this one. He’s a most unlikeable character, but gets caught up in a murder in which he somehow seems to be implicated, but he has three things the FBI doesn't: a personal connection to the case; an ungodly fortune; and his own unique brand of justice.
Bright Burning Things by Lisa Harding.
The story of Sonya, a single mother struggling with her demons while bringing up her four year old son in Dublin. It’s a book about sinking very low, and finding your way back, and Sonya is entirely believable. It’s very moving.