Who is The Two Dr. Komotis from The No. 1 Ladies' Detective Agency and what is their importance?

The case of fraudulent identical twins, the two Dr. Komotis, one a doctor and one an impostor, is one of the most challenging encountered by Mma Ramotswe. Her investigations lead her into situations that, more than most of those associated with her other cases, call on her to think quickly on her feet.