The film centers on young Mariah, a little girl who dreams of getting a dog for Christmas year after year. This Christmas her dream is fueled after seeing a puppy named Princess at the local pet store. To see if she's ready for the responsibility, Mariah is tasked with dog-sitting her uncle's crazy canine Jack, who upends the family's holiday preparations with his various shenanigans.目光闪了一下，又爬进驾驶室，不过这次不是开车。而是掀开驾驶座，从座位下的备用箱里找到几把维修车子的改刀和起子什么的，最重要的是，陈源在里面找到一桶大概十斤装的汽油。
