The book "The Ghost Device" by Murray Leinster is an exciting science fiction novel that tells the story of an invention equipped with an amazing function: it can cause interference with other realities. The main character decides to study this mysterious function of the device and discovers an incredible world of parallel universes. But among these realities there is also one where a strange ghost is present, which leads to unpredictable consequences. Will the main character be able to solve the secret of the device and understand how to influence parallel realities to settle the conflict with supernatural forces? "The device with a ghost" is an exciting book that continues to surprise readers until the last page.