Books in the Hidden Series series

When everyone thinks your sister committed suicide, it's hard to prove she was murdered.Kim is unable to accept Charley's sudden death. Crippled by an unnatural amnesia, her questions are met with wall after wall. As she doubts her sanity, she realises her investigation is putting those around her in danger.The only person who seems to know anything is Matthew, an elusive stranger who would rather vanish than talk. Despite his friendly smile, Kim isn't sure she can trust him. But if she wants to protect her family from further danger, Kim must work with Matthew to discover how Charley died - before it's too late.