I'm hoping someone can identify this young-adult/children's sci-fi book. I read it in 1996-1997, but I remember thinking it was written in the 1980s.
The main character was a boy (maybe in his early teens) and over the course of the book he gained a female companion of the same age. I think the boy and his father had a vegetable garden growing in their basement, but it was illegal for them to grow their own food so they hid the trapdoor to the basement under their refrigerator. The boy's father was an important scientist (or something of that nature) and he goes missing (taken by the evil government?) and the boy has to find him.
There is a scene where the boy is at school and is sent to the school counselor or doctor to be given an anti-depressant or tranquilizer pill, the counselor (a male) is sympathetic to the boy and tries to help him and the girl to find the boy's father (and possibly the girl's parents too?). There was also a scene where the boy and girl go to an abandoned building/warehouse to meet someone who can give them information on their parents (maybe they meet each other for the first time at the building?). It seems like there was also a mention of golf clubs in relation to the boy's father and a mention of Crackerjack rings in relation to the girl, but I know a Crackerjack ring played a part in another book I read around the same time so I could be confused:).
Sorry this is so long, I only read part of the book and would like to find out how it ends.