Cause Of Death: Unknown

"Or at least that's what's on his death certificate."
Robert Engelman: a university lecturer, husband and devoted father. At the age of 43 he disappeared without a trace, his 8 year old daughter was the only witness. After 12 years of unneeded therapy and unanswered questions, she discovers her Father's journal. Can this aid her in finding out the cause of his leaving and even how to get him back?