No Other Darkness by Sarah Hilary

When two young boys are found dead in an underground bunker, it shakes DI Marnie Rome and her team to the core, especially when it's determined that the children died five years ago. Back then, there were no homes on the land, only lots of trees--residents moved into the area a year and a half ago. Does the Doyle family, whose property the boys were found on, have some connection to the crime, or might the builder of the houses, since he knew there were bunkers on the land he was developing? Marnie and DS Noah Jake delve deeply into the lives of the residents, hoping to find the answers in this particularly heartbreaking case.