Arthur Tresting Investigations

Arthur and Checker are business partners, but Checker commutes by computer, so Arthur is the client-facing half of the partnership. They can afford nicer accommodations in a safer area, but Arthur likes to throw in pro bono work to help people to need it, so he wants it closer to the people who will need it.

In Zero Sum Game they're hired to find Reginald Kingsley's murderer, which leads them to Pithica and Courtney Polk. Pithica attempts to use local gang members to assassinate Arthur in the office, which leads to Cas mathing the bars off the second-story window and flying in to save him.

After Pilar is fired from her temp job in Half Life, Arthur and Checker hire her to be their much-needed office manager.