Dora, a girl who has spent most of her life exploring the jungle with her parents, now must navigate her most dangerous adventure yet: high school. Always the explorer, Dora quickly finds herself leading Boots (her best friend, a monkey), Diego, and a rag tag group of teens on an adventure to save her parents and solve the impossible mystery behind a lost Inca civilization.

27 years after overcoming the malevolent supernatural entity Pennywise, the former members of the Losers' Club, who have grown up and moved away from Derry, are brought back together by a devastating phone call.