And Then I Found Out the Truth — Jennifer Sturman

Delia Truesdale is still searching for the truth about her mother, who is in hiding somewhere in South America. But for now, Delia has to make do with her mystery-solving in New York City, alongside her Aunt Charley (a downtown hipster), her Aunt Patience(an uptown ice queen), a detective with a questionable taste in neckties, an eccentric psychic, her brainiac friend, and Quinn, the wealthy, gorgeous boy who--gasp!-- seems to return Delia's affections. Too bad Quinn's shady CEO dad may be involved in the scheme Delia is trying to crack. And a trip to South America may be in order after all...