The BBC explains: "The series will transport three players and viewers at home to the fictional town of Mortcliff where a dastardly crime has been committed. Their task: to discover whodunnit.
"The show is a play along and immersive investigation that can be enjoyed every step of the way. Like any good quiz, crime is crammed with titillating reveals, but as the drama unfolds, more suspects and clues will come to light. With their critical thinking put to the test will players and viewers be able to identify the killer?"
Calman already presents quiz show The Boss on BBC One, which is now back on screens at 2:15pm. Her TV profile is also on the rise as one of the contestants in the new series of Strictly Come Dancing.
Talking about taking on the role of hosting Armchair Detectives, Calman says: "I'm so excited to be presenting Armchair Detectives for BBC One Daytime. I love a TV crime drama and now I get to help the British public and the contestants in the studio solve one! I can't wait to get started and get solving!"
BBC Commissioning Editor Jo Street comments: "Susan's mischievous sense of humour and background as a lawyer gives her means, motive and opportunity to be the perfect host for this dramatic new whodunnit show."
Armchair Detectives will be shown on BBC One later this year.