at home? in home??

Please use past tense and future tense otherwise you can say:
LEAVE MY BOOK IN MY HOUSE= YOU LEAVE MY BOOK IN MY
HOUSE, LEAVE MY BOOK AT HOME = YOU LEAVE MY BOOK AT
HOME.

I leave my book at my home.

Home always uses 'at'

If you want to use 'in', then:
I leave my book in my house/my apartment/my school.

I leave my book in my home