Mortimer Beckett is a video game series that consists of three games so far. All the games are adventure games, or point 'n clicks.
The main plot is always to find items to advance to higher chapters. Also, you can use items called "puzzle pieces" which will let you interact with other characters, items, or animals. In the first two games, the objects are broken down into pieces and scattered throughout the different sections of chapters. In the third game the only difference is that pieces are not broken down, making it more like an I Spy game.
Source: Wikipedia, "Mortimer Beckett", available under the CC-BY-SA License.