What is the main conflict in The Shining by Stephen King?

As the family passes the first months at the hotel, Wendy notices that her husband’s drinking symptoms begin to come back even though there is nothing to drink. Then Danny is choked by what he describes as a dead woman in the bathtub of Room 217. Jack finds nothing in the room on first glance. Wendy is determined that it was Jack who hurt the boy again, as he did several years prior in a drunken rage. Their history of bad times in their marriage and bad experiences with their parents cause Jack and Wendy to build cases against each other, pushing them further and further apart.