When Dave's amateur band loses its lead singer just before a gig, Tina offers to fill in, however her high standards are out of tune with the rest of the group. Also, Marty quickly regrets letting his needy boss, Jerry, crash at his new place.

When Tina and Gemma get more than they bargained for in a revealing art class, Calvin can't hide his jealousy and takes drastic action. Also, Dave, Marty and Malcolm team up to crack the case of an unfinished mystery novel.