I am having trouble with my basil

Something keeps eating my basil, it is not the slugs or snails, there are no trails however every morning I came out an another leaf would be gone until I had none left.

Does anyone know how I could have combatted this, I am trying again indoors now but would like to have it outside next summer?

Any thoughts?

it's probably dessication due to cold. Basil likes to be in the warm or a cool place such as a cold greenhouse will do