Holmes and Watson come face to face with Moriarty when their one-time adversary is brought in as a consultant on a kidnapping case. Meanwhile, Detective Bell continues his struggle on the road to recovery. Natalie Dormer Returns as Moriarty.
Kevin volunteers to help Mott and his seven kids prepare for the holidays while Mott's wife is away, much to the dismay of Donna who is left high and dry on her own until Kyle swoops in to help.
Liza accompanies Josh to a musical festival and helps Charles with a work assignment.
Sparks fly at the annual Empirical Publishing picnic. Liza finds herself caught between Josh and Charles.
Liza receives a great opportunity at work, but there's a catch. Josh meets someone new. Maggie ruffles some feathers.