Done In by Fate

This is the story of Luca Aines. He lost his parents, his brothers went missing in action during the war. His only family left is his sister, she is studying abroad and couldn't care less about him. He finds his weird life set up as perfect and has no desire for it to get better because in his mind that means that there is no risk of it getting worse. His life continues how he likes it until something disturbs the peace... One of his brothers that has been missing for four years finally appears! But where is the other brother? Why can't this one remember anything? Is there more to this story than meets the eye? Well Luca does not care and is just happy he has one brother back. He does not want to get involved in this weird case revolving around his family. That is until he meets a certain someone who changes his mind... (This is an extremely slow-burn, and romance is not the main topic. This is a mystery book.)