Twelve-year-old Pavi Sharma is an expert at the Front Door Face: the perfect mix of puppy dog eyes and a lemonade smile, the exact combination to put foster parents at ease as they open their front door to welcome you in. After being bounced around between foster families and shelter stays, Pavi is a foster care expert, and she runs a "business" teaching other foster kids all she has learned. With a wonderful foster family in mom Marjorie and brother Hamilton, things are looking up for Pavi.

Then Pavi meets Meridee: a new five-year-old foster kid, who is getting placed at Pavi's first horrendous foster home. Pavi knows no one will trust a kid about what happened on Lovely Lane, even one as mature as she is, so it's up to her to save Meridee.

With help from Hamilton, brooding eighth grader Santos, and Hamilton's somewhat obnoxious BFF Piper, they set off on an important mission with life-changing stakes. Pavi will stop at nothing to keep Meridee safe.