Things not seen by Andrew Clements?

This book is about 15 yr old Bobby who turns invisible. His parents keen him home from school and tell him not to tell anyone. Then bobby meets a blind girl name alicia. she helps him find a cure. But child services come to check on bobby after missing a month of school so his parents tell them he went missing. eventually bobby finds sheila borden. a woman who has the same problem as him. but shiela wants to stay invisible unlike bobby. i hope this helped