A bookmark is adjustable to closely fit the height of a book, magazine, or the like in order to preclude inadvertent slipping or falling from the work. The present bookmark essentially comprises a strand of material having opposite first and second ends, with the ends passing through one or more adjuster beads from opposite directions to form a loop. The two strands thus “criss-cross” within the passage through the bead, with their frictional interference and bends around the sides of the bead(s) to pass laterally through the bead(s), providing a good frictional fit in order to hold the adjustment as desired. The loop is passed over one cover and group of pages in the book or work, with one side of the loop passing around the back of the spine and the opposite side of the loop passing between the pages of interest to mark the place.