Sleuths, Sabotage, and Sandcastles

The last thing Lizzie Brown wants to do on the 104-degree August day is participate in the Sandcastle Showdown. But thanks to her overly competitive twin sister, they’re challenging the four-time champ.

When the eccentric inventor vanishes before defending his crown, everyone brushes it off – except the twins. A cryptic phone call sparks their suspicion of foul play, propelling them into a search for their toughest competitor. Can the twins beat the heat and uncover the truth in time?