The Truth About Ruby Cooper by Liz Nugent

Ruby Cooper and her sister, Erin, live an idyllic life in their close-knit church community in Boston. But when Ruby is 16, she is involved in an incident that causes her family's world to implode. Across decades, the fallout leaves a wake of destruction behind Ruby in Dublin and Erin in Boston. Not that Ruby wants to think about the past. But it can't stay a secret forever.