An old DJ competitor of Jack's shows up to fix the plumbing at Dani's house, and Dani's lyric book of songs mysteriously goes missing. When Sam and Dani totally fall for his charm, Max and Ben must turn detectives to help Jack prove it's his old nemesis who's nicked the book and is not what he seems.

Dani discovers a famous branch of her family tree who has definitely lost touch with his roots! The now-famous celebrity comes to visit, but is truly on another wavelength, so the gang contrive a series of lessons to help get him get back to his real self.

Dani is upset that she has no date for Valentine's Day, but Max is making loads of money delivering flowers and candy to love-struck clients via Ben dressed up as a cherub. While Sam is doing research on animal hormones, Dani breaks a bottle by mistake. The 'love potion' falls on Dani and makes her an object of accidental love for, of all people, Ben!