The mystery in this novel is real. Dad is missing and can‘t be found. Did he leave of his own free will? Was he murdered or could he have had an accident? The other family members are mom, fraternal twins and the youngest son who is autistic and has Angelmans syndrome. Eugene is non verbal so he doesn‘t seem to be able to communicate what happened to dad while they were in the park for a hike and a picnic. Searches don‘t supply answers. 5