In 'Chrono Chums: Who's There?', you play as a quirky librarian with the unusual ability to converse with historical figures through a mysterious book that opens portals to different times. When strange anomalies start to affect the timeline, you must team up with a handful of eccentric historical 'chums', like a skeptical Cleopatra and a scheming Nikola Tesla, to uncover the source of the disturbances. As you jump between eras, you must gather clues, solve puzzles, and navigate comedic misunderstandings while avoiding temporal paradoxes and hilariously wrong historical interpretations. Your choices will affect both the past and your present—leading to wildly different endings.