The Barton siblings are faced with a decision: care of their ailing mother at home or put her in a nursing home. But even if she thrives under their personal care, can they survive each other? Logbook chronicles the domestic struggle of three siblings attempting to juggle caring for an elderly parent through the eyes of the fourth sibling, Mark 'Sparks' Barton. Mark, a radio officer with the merchant navy, was at sea during the last months of his mother's life. To cope with her sudden loss and the need for closure, he reads the logbook the family and professionals kept during that time. The logbook reveals the stronger ties between mother and children, but it also reveals some startling truths. As the friction between siblings rises and the strain of caring for an increasingly weak mother begins to take its toll, a valuable family heirloom is found to be missing. Can the answers be found in the Logbook?