Susanne Dove and Jacob Benedick are agents of The Seekers.
That is the name of the private company run by, and likely founded by, Una Frost, a somewhat prickly mature woman who is friendly with but still reservedly distant from her employees so as to allow her to assign them difficult (read deadly) problems to be solved and then watch them walk off to carry out her instructions or lose their lives in the process. The impression is given that the organization has a number of operative working for it but the two that are followed throughout all the adventures are Dove and Benedick.
The Seekers seems to be a cross between a private investigations firm and a private intelligence organization. It is said on several blogs that this company, while available for a variety of assignments, specializes in "finding missing persons". This could be anywhere from a runaway spouse to an embellisher fleeing with stolen loot to government turncoats who defect to the other side. Their rates must be impressive as Frost thinks nothing of dispatching them to wherever in the world their target might have headed or been taken and since the irascible Frost is not one to waste a penny, it is a safe bet that she charges a pretty one for their services.
Benedick is the senior of the two; a blond-haired man likely in his mid 30s still with an occasional spring in his step but with enough gravitas to come across as capable and competent as needed.
Dove is a dark-haired beauty with a stunning figure and no qualms about letting that be known, though she does not blatantly flaunt it. She is probably in her mid-to-late 20s and despite her put-on airy ways at times, she is quite clever and inventive and has crafted at least one handy little gadget to help on a mission.
Both Benedick and Dove are single and neither show any inclination to change that; i.e., no steady relationships though Dove does meet a man she gets interested in part way through the series. That does not mean neither of them are adverse to dalliances on occasion. There is no romantic feelings between these two whatsoever; they are friendly work partners whose attitudes come across at times as a sibling rivalry with the older more serious Benedick occasionally annoyed with the near-carefree airs of Dove. On the job, though, they work well as a team.