Sherlock investigates a case involving a wealthy philanthropist who believes his incurable illness was given to him on purpose. Meanwhile, Sherlock tries to teach Joan his deductive skills by sending…

The team gets a major break in the Sandstorm case when they discover Shepherd’s true identity… and a decades-old connection between her and Weller.

A new case arrives at Liz’s doorstep, where someone has left a diorama depicting a crime soon to be committed. Meanwhile, Red explores a new business opportunity.