After escaping the compound where she grew up, a young girl with mysterious powers meets the world's greatest superhero, Flow! Realising the girl, named Solana, is in danger and unable to look the other way, Flow - or rather, Hilda Hallow - takes the child into her (rather inexperienced) care. Blending elements of action and light humour with emotional storytelling, Hero and Child is the tale of how their newfound, odd little family came to be - as well as the dangerous game of cat and mouse the heroine must play with Solana's pursuers to keep her safe. Even after saving the world several times, being a mother might just be Hilda's hardest challenge yet.