zzle-packed mystery collide in the first book in Lauren Magaziner's hilarious and high-stakes four-book middle grade series in which the reader must help Carlos and his friends put together the clues to save his mom's detective agency.

In this wildly entertaining and interactive adventure, YOU pick which suspects to interview, which questions to ask, and which clues to follow. You pick the path--you crack the case!

Carlos Serrano has never solved a mystery in his life. But when Carlos's mom gets sick with a flu on the morning of an investigation that could save her failing detective agency, Carlos takes on the case.

With the help of his best friend, Eliza, and her wild little brother, Frank, Carlos must uncover a mystery involving an eccentric local millionaire, anonymous death threats, and a buried treasure. But with tricky riddles, cagey suspects, hidden secrets, and dozens of impossible choices, they need your help!

Can you help Carlos and his friends find the culprit and save Las Pistas Detective Agency? Or will it be case closed?

Middle grade readers will enjoy all four books in this favorite series: Mystery in the Mansion (#1), Stolen from the Studio (#2), Haunting at the Hotel (#3), and Danger on the Dig (#4)!