The Curse Workers book 1 of 3 completed series

Cassel comes from a family of curse workers, people who have the power to change your emotions, your memories, your luck, by the slightest touch of their hands. Since curse work is illegal, they're all criminals. 

But not Cassel. He hasn't got the magic touch, so he's an outsider, the straight kid in a crooked family, as long as you ignore one small detail: He killed his best friend, Lila. Now he is sleepwalking, propelled into the night by terrifying dreams about a white cat.  He also notices that his brothers are keeping secrets from him. As Cassel begins to suspect he's part of a huge con game, he must unravel his past and his memories. To find out the truth, Cassel will have to outcon the conmen.