The Tesseract, the actual tesseract! The possibilities were endless for HYDRA if they possessed it. Outrunning the others and SHIELD wasn't a concern but beating Loki to it would prove challenging he-she also had a stake in this after all the comic cube technically belonged to her people. But Contessa believed in "finder's keepers" that cube belonged to Hydra!
"Is there a plan or do we just knock Modok over and take the cube from his creepy little doll hands?"