Noah Holiday lives his life being constantly reminded of a tragic event that occurred while he was a baby in 2004. During his rough times alone, Noah rediscovers his long lost childhood teddy bear; however, what once brought him great joy now has a mind of his own and has sinister plans in store for him.
As a young New York couple goes from college romance to marriage and the birth of their first child, the unexpected twists of their journey create reverberations that echo over continents and through lifetimes.
Though Kevin has evidenced 23 personalities to his trusted psychiatrist, Dr. Fletcher, there remains one still submerged who is set to materialize and dominate all the others. Compelled to abduct three teenage girls led by the willful, observant Casey, Kevin reaches a war for survival among all of those contained within him — as well as everyone around him — as the walls between his compartments shatter apart.