Harrison

In the novel They Came to Baghdad, Harrison is a man from Kirkuk who is staying at the Tio Hotel at the time of the murder of Henry Carmichael.

His room is on the same floor as the one on which Carmichael is found dead and according to Mr Dakin, Harrison is "one against whom nothing is known". Nonetheless Dakin does not consider him a plausible suspect. Carmichael had evaded so many attempts on his life during his journey. Something caused him to drop his guard at the Tio. He would not have dropped his guard with a stranger like Harrison.

When Mrs Hamilton Clipp arrived at the Tio, Marcus Tio, the proprietor asks why Harrison did not come down to greet her. Either he knew Harrison is an acquaintance of Mrs Clipp, or more likely, Tio simply assumes that people from Kirkuk (Mrs Clipp is on her way to Kirkuk to see her daughter) know each other.