Tenant bailed, what do I do?

[Allen Humphries]

I have a 3 bedroom property outside of St. Louis Missouri where I rent to college students. I currently have 3 girls who signed separate contracts in the unit. One of the tenants has disappeared and left the other two in the unit. The two that are left there are saying they shouldn’t be responsible for the remaining part of the rent. What can I do? Can I hold the one that left responsible? Are the other two liable for the rest of the rent? Please help! Thanks in advance!