The Animorphs discover that Hewlett Aldershot the Third has been run over by Controllers and is being kept secretly in a hospital where he is heavily guarded. He has a very high job in the government. Since he cannot be infested while in a coma, Visser Three acquires his DNA in hopes of impersonating him to eventually acquire an even more senior official. They decide to morph mosquitoes with the theory that they can acquire him by sucking his blood without being in their natural forms where the Yeerk guards might notice them. While they are doing it, they are transported to Z-Space when their extra mass is caught in the slipstream of an Andalite ship heading for the Leera where there is a Yeerk invasion underway. Right before they suffocate, they are rescued and taken aboard.